guide (v.) Look up guide at Dictionary.com
late 14c., "to lead, direct, conduct," from Old French guider "to guide, lead, conduct" (14c.), earlier guier, from Frankish *witan "show the way" or a similar Germanic source, from Proto-Germanic *witanan "to look after, guard, ascribe to, reproach" (cognates: German weisen "to show, point out," Old English witan "to reproach," wite "fine, penalty"), from PIE *weid- "to see" (see vision). The form of the French word influenced by Old Provençal guidar (n.) "guide, leader," or Italian guidare, both from the same source. Related: Guided; guiding. Guided missile, one capable of altering course in flight, is from 1945.
guide-post (n.) Look up guide-post at Dictionary.com
also guidepost, 1761, from guide (v.) + post (n.1). Placed at a fork or intersection, with signs to guide travelers on their way.
guideline (n.) Look up guideline at Dictionary.com
1785, "line marked on a surface before cutting," from guide + line (n.). Meaning "rope for steering a hot-air balloon" is from 1846. In figurative use by 1948. Related: Guidelines.
Guido Look up Guido at Dictionary.com
masc. proper name, Italian, literally "leader," of Germanic origin (see guide (v.)). As a type of gaudy machoism often associated with Italian-Americans, 1980s, teen slang, from the name of character in Hollywood film "Risky Business" (1983).
guidon (n.) Look up guidon at Dictionary.com
"small flag," originally one borne by a military unit to direct movements, 1540s, from Middle French guidon (16c.), from Italian guidone "battle standard," from guidare "to direct, guide," from Old Provençal guidar "to guide," from Proto-Germanic *witanan "to look after, guard" (see guide (v.)).
Guidonian (adj.) Look up Guidonian at Dictionary.com
1721, in reference to the system of musical notation devised by Guido d'Arezzo, who lived early 11c.
guild (n.) Look up guild at Dictionary.com
also gild, early 13c., yilde (spelling later influenced by Old Norse gildi "guild, brotherhood"), a semantic fusion of Old English gegield "guild, brotherhood," and gield "service, offering; payment, tribute; compensation," from Proto-Germanic *geldjam "payment, contribution" (cognates: Old Frisian geld "money," Old Saxon geld "payment, sacrifice, reward," Old High German gelt "payment, tribute;" see yield (v.)).

The connecting sense is of a contribution or payment to join a protective or trade society. But some look to the alternative prehistoric sense of "sacrifice," as if in worship, and see the word as meaning a combination for religious purposes, either Christian or pagan. The Anglo-Saxon guilds had a strong religious component; they were burial societies that paid for Masses for the souls of deceased members as well as paying fines in cases of justified crime. Continental guilds of merchants, incorporated in each town or city and holding exclusive rights of doing business there, arrived after the Conquest. In many cases they became the governing body of a town (compare Guildhall, which came to be the London city hall). Trade guilds arose 14c., as craftsmen united to protect their common interest.
guilder (n.) Look up guilder at Dictionary.com
Dutch gold coin, late 15c., probably from a mispronunciation of Middle Dutch gulden, literally "golden," in gulden (florijn) or some similar name for a golden coin (see golden).
guile (n.) Look up guile at Dictionary.com
mid-12c., from Old French guile "deceit, wile, fraud, ruse, trickery," probably from Frankish *wigila "trick, ruse" or a related Germanic source, from Proto-Germanic *wih-l- (cognates: Old Frisian wigila "sorcery, witchcraft," Old English wig "idol," Gothic weihs "holy," German weihen "consecrate"), from PIE root *weik- (2) "consecrated, holy."
guileful (adj.) Look up guileful at Dictionary.com
c. 1300, from guile + -ful. Nowadays only in poems and dictionaries. Related: Guilefully; guilefulness.
guileless (adj.) Look up guileless at Dictionary.com
1710, from guile + -less. Related: Guilelessly; guilelessness.
guillotine (n.) Look up guillotine at Dictionary.com
"The name of the machine in which the axe descends in grooves from a considerable height so that the stroke is certain and the head instantly severed from the body." ["Universal Magazine of Knowledge and Pleasure," January 1793], 1791, from French guillotine, named in recognition of French physician Joseph Guillotin (1738-1814), who as deputy to the National Assembly (1789) proposed, for humanitarian and efficiency reasons, that capital punishment be carried out by beheading quickly and cleanly on a machine, which was built in 1791 and first used the next year. Similar devices were used in the Middle Ages. The verb is first attested 1794. Related: Guillotined; guillotining.
guilt (n.) Look up guilt at Dictionary.com
Old English gylt "crime, sin, moral defect, failure of duty," of unknown origin, though some suspect a connection to Old English gieldan "to pay for, debt," but OED editors find this "inadmissible phonologically." The -u- is an unetymological insertion. In law, "That state of a moral agent which results from his commission of a crime or an offense wilfully or by consent" [Century Dictionary], from early 14c. Then use for "sense of guilt," considered erroneous by purists, is first recorded 1680s. Guilt by association recorded by 1919.
guilt (v.) Look up guilt at Dictionary.com
"to influence someone by appealing to his sense of guiltiness," by 1995, from guilt (n.). Related: Guilted; guilting. Old English also had a verbal form, gyltan (Middle English gilt), but it was intransitive and meant "to commit an offense, act criminally."
guiltiness (n.) Look up guiltiness at Dictionary.com
late 14c., from guilty + -ness.
guiltless (adj.) Look up guiltless at Dictionary.com
late Old English gyltleas; see guilt (n.) + -less. Related: Guiltlessly; guiltlessness.
guilty (adj.) Look up guilty at Dictionary.com
Old English gyltig "offending, delinquent, criminal," from gylt (see guilt (n.)). In law, "that has committed some specified offense," late 13c. Of conscience, feelings, etc., 1590s. Meaning "person who is guilty" is from 1540s. To plead not guilty is from 15c.; to plead guilty is 19c., though, as OED notes, "Guilty is technically not a plea, but a confession." Related: Guiltily; guiltiness.
guinea (n.) Look up guinea at Dictionary.com
former British coin, 1660s, from Guinea, because the coins were first minted for British trade with Guinea (but soon in domestic use) and with gold from Africa. The original guinea was in use from 1663 to 1813.
Guinea Look up Guinea at Dictionary.com
region along the west coast of Africa, presumably from an African word (perhaps Tuareg aginaw "black people"). As a derogatory term for "an Italian" (1896) it is from Guinea Negro (1740s) "black person, person of mixed ancestry;" applied to Italians probably because of their dark complexions relative to northern Europeans, and after 1911 it was occasionally applied to Hispanics and Pacific Islanders as well. New Guinea was so named 1546 by Spanish explorer Inigo Ortiz de Retes in reference to the natives' dark skin and tightly curled hair. The Guinea hen (1570s) is a domestic fowl imported from there. Related: Guinean.
guinea pig (n.) Look up guinea pig at Dictionary.com
rodent native to South America, 1660s. It does not come from Guinea and has nothing to do with the pig. Perhaps so called either because it was brought back to Britain aboard Guinea-men, ships that plied the triangle trade between England, Guinea, and South America [Barnhart, Klein], or from its resemblance to the young of the Guinea-hog "river pig" [OED], or from confusion of Guinea with the South American region of Guyana (but OED is against this). Pig probably for its grunting noises. In the extended sense of "one subjected to an experiment" it is first recorded 1920, because they were commonly used in medical experiments (by 1865).
Guinevere Look up Guinevere at Dictionary.com
fem. proper name, from Welsh Gwenhwyvar, literally "white-cheeked."
Guinness Look up Guinness at Dictionary.com
Irish brewery, founded 1759 by Arthur Guinness (1725-1803) in Dublin.
guise (n.) Look up guise at Dictionary.com
late 13c., "style or fashion of attire," from Old French guise "manner, fashion, way," from Frankish *wisa or some similar Germanic source, from Proto-Germanic *wison "appearance, form, manner," from *wissaz (cognates: Old High German wisa "manner, wise"), from PIE root *weid- "to see" (see vision). Sense of "assumed appearance" is from 1660s, from earlier meaning "mask, disguise" (c. 1500).
guiser (n.) Look up guiser at Dictionary.com
"masquerader, mummer, one who goes from house to house, whimsically disguised, and making diversion with songs and antics, usually at Christmas," late 15c., agent noun from guise.
guitar (n.) Look up guitar at Dictionary.com
lute-like musical instrument, 1620s, from French guitare, which was altered by Spanish and Provençal forms from Old French guiterre, earlier guiterne, from Latin cithara, from Greek kithara "cithara," a triangular seven-stringed musical instrument related to the lyre, perhaps from Persian sihtar (see sitar). The name reached English several times, including giterne (early 14c., from Old French), in reference to various stringed, guitar-like instruments; the modern word is also directly from Spanish guitarra (14c.), which ultimately is from the Greek. The Arabic word is perhaps from Spanish or Greek, though often the relationship is said to be the reverse. The modern guitar is one of a large class of instruments used in all countries and ages but particularly popular in Spain and periodically so in France and England. Other 17c, forms of the word in English include guittara, guitarra, gittar, and guitarre. Compare zither, gittern.
guitarist (n.) Look up guitarist at Dictionary.com
1770, from guitar + -ist.
Gujarati Look up Gujarati at Dictionary.com
from Gujarat, state in western India, Hindi, from Sanskrit Gurjara.
gulag (n.) Look up gulag at Dictionary.com
system of prisons and labor camps, especially for political detainees, in the former Soviet Union; rough acronym from Russian Glavnoe upravlenie ispravitel'no-trudovykh lagerei "Chief Administration of Corrective Labor Camps," set up in 1931.
gulch (n.) Look up gulch at Dictionary.com
"deep ravine," 1832, perhaps from obsolete or dialectal verb gulsh "sink in" (of land), "gush out" (of water), from Middle English gulchen "to gush forth; to drink greedily" (c. 1200). Compare gulche-cuppe "a greedy drinker" (mid-13c.). "There appears to be no etymological connection with gully" [Century Dictionary].
gules (adj.) Look up gules at Dictionary.com
"red," in heraldic descriptions, c. 1300, from Old French goules "neckpiece of (red) fur," plural of gole, guele "throat," from Latin gula "throat" (see gullet). Or perhaps the reference is to the red open mouth of the heraldic lion. Derivation from Persian gul "a rose" is "a poetical fancy" [Century Dictionary].
gulf (n.) Look up gulf at Dictionary.com
late 14c., "profound depth," from Old French golf "a gulf, whirlpool," from Italian golfo "a gulf, a bay," from Late Latin colfos, from Greek kolpos "bay, gulf of the sea," earlier "trough between waves, fold of a loose garment," originally "bosom," the common notion being "curved shape." This is from PIE *kwelp- "to arch, to vault" (compare Old English hwealf, a-hwielfan "to overwhelm"). Latin sinus underwent the same development, being used first for "bosom," later for "gulf" (and in Medieval Latin, "hollow curve or cavity in the body"). The geographic sense "large tract of water extending into the land" (larger than a bay, smaller than a sea, but the distinction is not exact and not always observed) is in English from c. 1400, replacing Old English sæ-earm. Figurative sense of "a wide interval" is from 1550s. The U.S. Gulf States so called from 1836. The Gulf Stream (1775) takes its name from the Gulf of Mexico.
gull (n.2) Look up gull at Dictionary.com
cant term for "dupe, sucker, credulous person," 1590s, of uncertain origin. Perhaps from verb meaning "to dupe, cheat" (see gull (v.)). Or it is perhaps from (or influenced by) the bird name (see gull (n.1)); in either case with a sense of "someone who will swallow anything thrown at him." Another possibility is Middle English gull, goll "newly hatched bird" (late 14c.), which is perhaps from Old Norse golr "yellow," from the hue of its down.
gull (n.1) Look up gull at Dictionary.com
shore bird, early 15c. (in a cook book), probably from Brythonic Celtic; compare Welsh gwylan "gull," Cornish guilan, Breton goelann; all from Old Celtic *voilenno-. Replaced Old English mæw (see mew (n.1)).
gull (v.) Look up gull at Dictionary.com
"to dupe, cheat, mislead by deception," 1540s, earlier "to swallow" (1520s), ultimately from gull "throat, gullet" (early 15c.); see gullet. Related: Gulled; gulling.
Gullah Look up Gullah at Dictionary.com
"of or pertaining to blacks on the sea-islands of Georgia and South Carolina," 1739 (first attested as a male slave's proper name), of uncertain origin. Early 19c. folk etymology made it a shortening of Angola (homeland of many slaves) or traced it to a West African tribal group called the Golas.
gullet (n.) Look up gullet at Dictionary.com
"passage from the mouth of an animal to the stomach," c. 1300 (as a surname), from Old French golet "neck (of a bottle); gutter; bay, creek," diminutive of gole "throat, neck" (Modern French gueule), from Latin gula "throat," also "appetite," from PIE root *gwele- (3) "to swallow" (cognates: Latin gluttire "to gulp down, devour," glutto "a glutton;" Old English ceole "throat;" Old Church Slavonic glutu "gullet," Russian glot "draught, gulp;" Old Irish gelim "I devour").
gullibility (n.) Look up gullibility at Dictionary.com
1782, earlier cullibility (1728), probably from gull (n.2) "dupe, sucker" + -ability.
gullible (adj.) Look up gullible at Dictionary.com
1821, apparently a back-formation from gullibility. Spelling gullable is attested from 1818.
Gulliver Look up Gulliver at Dictionary.com
male proper name, from Old French goulafre "glutton," a very common name, found as a surname in Domesday Book (William Gulafra).
gully (n.) Look up gully at Dictionary.com
"channel in earth made by running water," 1650s, possibly a variant of Middle English golet "water channel" (see gullet). Gully-washer, American English colloquial for "heavy rainstorm," attested by 1887.
gulp (v.) Look up gulp at Dictionary.com
late 14c., a native coinage or else from Flemish gulpe or Dutch gulpen "to gush, pour forth, guzzle, swallow," in any case possibly of imitative origin (compare Swedish dialectal glapa "to gulp down"). Related: Gulped; gulping.
gulp (n.) Look up gulp at Dictionary.com
1560s, from gulp (v.), or else from Flemish gulpe, Dutch gulp "stream of water, large draught."
gum (v.1) Look up gum at Dictionary.com
early 14c., gommen, "treat with (medicinal or aromatic) gums," from gum (n.1). In the transferred or figurative sense of "spoil, ruin" (usually with up), as if by some gummy substance, it is first recorded 1901, probably from the notion of machinery becoming clogged. Related: Gummed; gumming.
gum (n.1) Look up gum at Dictionary.com
c. 1300, "resin from dried sap of plants," from Old French gome "(medicinal) gum, resin," from Late Latin gumma, from Latin gummi, from Greek kommi "gum," from Egyptian kemai. As the name of a hardened, sweetened gelatine mixture as a candy, 1827. As a shortened form of chewing gum, first attested 1842 in American English. The gum tree (1670s) was so called for the resin it exudes. Latin gummi also is the source of German Gummi (13c.).
gum (n.2) Look up gum at Dictionary.com
"soft tissues of the mouth," Old English goma "palate, side of the mouth" (single or plural), from a Germanic source represented by Old Norse gomi "palate," Old High German goumo; related to Lithuanian gomurys "palate," and perhaps from PIE root *gheu- "to yawn" (source also of Old English ginian "to yawn;" see yawn (v.)).
gum (v.2) Look up gum at Dictionary.com
of infants, toothless adults, etc., "to chew or gnaw (something) with the gums," by 1907, from gum (n.2). Related: Gummed; gumming.
gum-drop (n.) Look up gum-drop at Dictionary.com
also gumdrop, type of confection, 1856, from gum (n.1) + drop (n.).
gumbo (n.) Look up gumbo at Dictionary.com
soup thickened with okra, 1805, from Louisiana French, probably ultimately from Central Bantu dialect (compare Mbundu ngombo "okra"). Also used for "the creole patois of Louisiana" (1838).
gummy (adj.) Look up gummy at Dictionary.com
"gum-like, sticky," late 14c., from gum (n.1) + -y (2). Related: Gumminess.
gump (n.) Look up gump at Dictionary.com
"dolt, numskull, foolish person," 1825, "a term most generally applied to a female" [Jamieson]; meaning "chicken" is from 1914, U.S. thieves' slang.