formerly (adv.) Look up formerly at Dictionary.com
"in times past," 1580s, from former (adj.) + -ly (2). A Middle English word for this was andersith "formerly, at former times" (early 14c.).
formic (adj.) Look up formic at Dictionary.com
1791 (in formic acid), literally "from ants," coined from Latin formica "ant" (see Formica (n.2)). The acid first was obtained in a fairly pure form in 1749 by German chemist Andreas Sigismund Marggraf (1709-1782), who prepared it by distilling red ants. It also is found in nettles and bee stings.
Formica (1) Look up Formica at Dictionary.com
proprietary name (1922) of a product manufactured originally by Formica Insulation Co. of Cincinnati, Ohio, U.S. (founded 1913). According to the company, the material (originally marketed as an industrial insulator) was so called because it could be used for mica, i.e., in place of mica, a more expensive natural insulator. Primarily used in consumer goods since c.1945.
Formica (2) Look up Formica at Dictionary.com
ant genus, 1843, from Latin formica "an ant," dissimilated from PIE *morwi- "ant" (cognates: Sanskrit vamrah "ant," Greek myrmex, Old Church Slavonic mraviji, Old Irish moirb, Old Norse maurr, Welsh myrion; and compare second element in pismire).
formicant (adj.) Look up formicant at Dictionary.com
"crawling like an ant," 1707, from Latin formicantem (nominative formicans), present participle of formicare (see formication).
formicary (n.) Look up formicary at Dictionary.com
"ant nest," 1816, from Medieval Latin formicarium, from Latin formica "ant" (see Formica (n.2)).
formication (n.) Look up formication at Dictionary.com
crawling sensation as of ants on the skin, 1707, from Latin formicationem (nominative formicatio), noun of action from formicare "to crawl like ants," from formica "ant" (see Formica (n.2)).
formidable (adj.) Look up formidable at Dictionary.com
mid-15c., "causing fear," from Middle French formidable (15c.), from Latin formidabilis "causing fear, terrible," from formidare "to fear," from formido "fearfulness, fear, terror, dread." Sense has softened somewhat over time, in the direction of "so great (in strength, size, etc.) as to discourage effort." Related: Formidably.
formless (adj.) Look up formless at Dictionary.com
1590s, from form (n.) + -less. Related: Formlessly; formlessness.
Formosa Look up Formosa at Dictionary.com
old name of Taiwan, given by the Portuguese, from Portuguese Formosa insula "beautiful island." The adjective is from the fem. of Latin formosus "beautiful, handsome, finely formed," from forma (see form (n.)). Related: Formosan (1640s).
formula (n.) Look up formula at Dictionary.com
1630s, "words used in a ceremony or ritual" (earlier as a Latin word in English), from Latin formula "form, draft, contract, regulation;" in law, "a rule, method;" literally "small form," diminutive of forma "form" (see form (n.)). Modern sense is colored by Carlyle's use (1837) of the word in a sense of "rule slavishly followed without understanding" [OED]. From 1706 as "a prescription, a recipe;" mathematical use is from 1796; chemistry sense is from 1842. In motor racing, "class or specification of a car" (usually by engine size), 1927.
formulae (n.) Look up formulae at Dictionary.com
plural of formula.
Men who try to speak what they believe, are naked men fighting men quilted sevenfold in formulae. [Charles Kingsley, "Letters," 1861]
formulaic (adj.) Look up formulaic at Dictionary.com
1845, from formula + -ic.
formular (n.) Look up formular at Dictionary.com
1560s, "a model, exemplar," from Latin formula (see formula) + -ar. As an adjective, from 1773 as "formal, correct;" 1880 as "of or pertaining to a formula."
formulary (n.) Look up formulary at Dictionary.com
1540s, "collection of set forms," from French formulaire "collection of formulae," from noun use of Latin adjective formularius, from formula "a form" (see formula). As an adjective in English, "of the nature of a formula," 1728. The Latin adjective also was used as a noun meaning "a lawyer skilled in composing writs."
formulate (v.) Look up formulate at Dictionary.com
"to express in a formula," 1837, from formula + -ate (2). Won out over formulize (1842); formularize (1845). Related: Formulated; formulating.
formulation (n.) Look up formulation at Dictionary.com
1848, noun of action from formulate (v.).
Fornax (n.) Look up Fornax at Dictionary.com
goddess of ovens in ancient Rome, from Latin fornax "furnace, oven, kiln" (see furnace). The dim constellation (representing a chemical furnace) was added by de Lacaille in 1756.
fornicate (v.) Look up fornicate at Dictionary.com
1550s, "have illicit sexual intercourse" (said of an unmarried person), from Late Latin fornicatus, past participle of fornicari "to fornicate" (see fornication). Perhaps in some cases a back-formation from fornication. Related: Fornicated; fornicating.
fornication (n.) Look up fornication at Dictionary.com
c.1300, from Old French fornicacion "fornication, lewdness; prostitution; idolatry" (12c.), from Late Latin fornicationem (nominative fornicatio), noun of action from past participle stem of fornicari "to fornicate," from Latin fornix (genitive fornicis) "brothel" (Juvenal, Horace), originally "arch, vaulted chamber, a vaulted opening, a covered way," probably an extension, based on appearance, from a source akin to fornus "brick oven of arched or domed shape" (see furnace). Strictly, "voluntary sex between an unmarried man and an unmarried woman;" extended in the Bible to adultery. The sense extension in Latin is perhaps because Roman prostitutes commonly solicited from under the arches of certain buildings.
fornicator (n.) Look up fornicator at Dictionary.com
late 14c., from Late Latin fornicator, agent noun from fornicat-, stem of fornicari "to fornicate" (see fornication). Of the fem. forms, fornicatrice is c.1500, fornicatrix 1580s, fornicatress 1590s.
fornix (n.) Look up fornix at Dictionary.com
from 1680s in reference to various arched formations (especially in anatomy), from Latin fornix "arch, vaulted chamber, cellar, vaulted opening" (see fornication).
forsake (v.) Look up forsake at Dictionary.com
Old English forsacan "object to, oppose, refuse, deny; give up, renounce" (past tense forsoc, past participle forsacen), from for- "completely" + sacan "to struggle, dispute, wrangle; accuse, blame" (see sake). Related: Forsaking. Similar formation in Old Saxon farsakan, Dutch verzaken, Old High German farsahhan "deny, repudiate," Danish forsage "give up, refuse."
Forsake is chiefly applied to leaving that by which natural affection or a sense of duty should or might have led us to remain: as, to forsake one's home, friends, country, or cause; a bird forsakes its nest. In the passive it often means left desolate, forlorn. [Century Dictionary]
forsaken (adj.) Look up forsaken at Dictionary.com
mid-13c., past participle adjective from forsake. Related: Forsakenly.
forsook Look up forsook at Dictionary.com
past tense of forsake.
forsooth (adv.) Look up forsooth at Dictionary.com
Old English forsoð "indeed, verily," from for-, perhaps here with intensive force (or else the whole might be "for a truth"), + soð "truth" (see sooth).
forswear (v.) Look up forswear at Dictionary.com
Old English forswerian "swear falsely," also "abandon or renounce on oath," from for- "completely" + swerian "to swear." Related: Forswore; forsworn; forswearing.
forsworn (adj.) Look up forsworn at Dictionary.com
from Old English forsworenne, past participle of forswerian (see forswear).
forsythia (n.) Look up forsythia at Dictionary.com
1814, coined 1805 in Modern Latin as a genus name in honor of William Forsyth (1737-1804), Scottish horticulturalist who brought the shrub from China. The family name is from Gaelic Fearsithe "man of peace."
fort (n.) Look up fort at Dictionary.com
mid-15c., "fortified place, stronghold," from Middle French fort, from noun use in Old French of fort (adj.) "strong, fortified" (10c.), from Latin fortis "strong, mighty, firm, steadfast," from Old Latin forctus, possibly from PIE root *bhergh- (2) "high, elevated," with derivatives referring to hills and hill-forts (cognates: Sanskrit brmhati "strengthens, elevates," Old High German berg "hill;" see barrow (n.2)).
Fort Sumter Look up Fort Sumter at Dictionary.com
military installation in South Carolina, U.S., begun in 1827, named for U.S. Revolutionary War officer and Congressman Thomas Sumter (1734-1832), "The Carolina Gamecock." The family name is attested from 1206, from Old French sommetier "driver of a pack horse" (see sumpter).
forte (n.) Look up forte at Dictionary.com
1640s, from French fort "strong point (of a sword blade)," also "fort," from Middle French fort (see fort). Meaning "strong point of a person" is from 1680s. Final -e- added 18c. in imitation of Italian forte "strong."
forte (adj.) Look up forte at Dictionary.com
music instruction, "loud, loudly," from Italian forte, literally "strong," from Latin fortis "strong" (see fort).
forth (adv.) Look up forth at Dictionary.com
Old English forð "forward, onward, further, continually," perfective of fore, from Proto-Germanic *furtha- (cognates: Old Frisian, Old Saxon forth "forward, onward," Old Norse forð, Dutch voort, German fort), from PIE *prto-, from *pr-, from root *per- (1) "forward, through" (see per).
forthcoming (adj.) Look up forthcoming at Dictionary.com
"about to happen," 1530s; earlier was Old English forðcuman "to come forth, come to pass;" see forth + come (v.). Meaning "informative, responsive" is from 1835.
forthright (adj.) Look up forthright at Dictionary.com
Old English forðriht "direct, plain;" see forth + right. Related: Forthrightly; forthrightness.
forthwith Look up forthwith at Dictionary.com
c.1200 (prep); early 14c. (adv.), from forth + with. The Old English equivalent was forð mid.
forties (n.) Look up forties at Dictionary.com
1843 as the years of someone's life between 40 and 49; from 1840 as the fifth decade of years in a given century. See forty. Also a designation applied in various places and times to certain oligarchies, ruling classes, or governing bodies.
It is well known that society in the island [Guernsey] is, or perhaps we ought to say, for many years was, divided into two sets, called respectively the Sixties and the Forties, the former composed of the old families and those allied to them, the latter of families of newly-acquired wealth and position. ["The Dublin Review," October 1877]
Roaring Forties are rough parts of the ocean between 40 and 50 degrees latitude.
fortieth (adj.) Look up fortieth at Dictionary.com
Old English feowertigoða, from feowertig (see forty) + -th (1). Compare Old Norse fertugonde, Swedish fyrationde, Danish fyrretyvende.
fortification (n.) Look up fortification at Dictionary.com
early 15c., "strengthening," also "defensive earthworks, tower" (mid-15c.), from Middle French fortification "strengthening, fortification," from Late Latin fortificationem (nominative fortificatio), noun of action from past participle stem of fortificare (see fortify).
fortify (v.) Look up fortify at Dictionary.com
early 15c., "increase efficacy" (of medicine); mid-15c., "provide (a town) with walls and defenses," from Old French fortifiier (14c.) "to fortify, strengthen," from Late Latin fortificare "to strengthen, make strong," from Latin fortis "strong" (see fort) + facere "to make" (see factitious).

Sense of "to strengthen mentally or morally" is from late 15c. Meaning "add liquor or alcohol" is from 1880. Related: Fortified; fortifying.
fortissimo Look up fortissimo at Dictionary.com
1724, from Italian fortissimo, superlative of forte "loud, strong," from Latin fortis "strong" (see fort).
fortitude (n.) Look up fortitude at Dictionary.com
early 15c., from Middle French fortitude, from Latin fortitudo "strength, force, firmness," from fortis "strong, brave" (see fort).
fortitudinous (adj.) Look up fortitudinous at Dictionary.com
from Latin fortitudinem (nominative fortitudo; see fortitude) + -ous. Related: Fortitudinously.
fortnight (n.) Look up fortnight at Dictionary.com
17c. contraction of Middle English fourteniht, from Old English feowertyne niht, literally "fourteen nights," preserving the ancient Germanic custom of reckoning by nights, mentioned by Tacitus in "Germania" xi. Related: Fortnightly.
Fortran (n.) Look up Fortran at Dictionary.com
computer programming language, 1956, from combination of elements from formula + translation.
fortress (n.) Look up fortress at Dictionary.com
early 14c., from Old French forteresse "strong place" (12c.), variant of fortelesse, from Medieval Latin fortalitia, from Latin fortis "strong" (see fort) + English -ess, a fairly uncommon suffix (duress, largess being other examples), from Latin -itia, forming nouns of quality or condition.
fortuitous (adj.) Look up fortuitous at Dictionary.com
1650s, from Latin fortuitus "happening by chance, casual, accidental," from forte "by chance," ablative of fors "chance" (related to fortuna; see fortune). It means "accidental, undesigned" not "fortunate." Earlier in this sense was fortuit (late 14c.), from French. Related: Fortuitously; fortuitousness.
fortuity (n.) Look up fortuity at Dictionary.com
1747, from fortuitous + -ity.
fortunate (adj.) Look up fortunate at Dictionary.com
late 14c., from Latin fortunatus "prospered, prosperous; lucky, happy," past participle of fortunare "to make prosperous," from fortuna (see fortune). Fortunate Islands "mythical abode of the blessed dead, in the Western Ocean," early 15c., translates Latin Fortunatae Insulae.