ancillary (adj.) Look up ancillary at Dictionary.com
"subservient, subordinate, serving as an aid," 1660s, from Latin ancillaris "relating to maidservants," from ancilla "handmaid," fem. diminutive of anculus "servant," literally "he who bustles about," from root of ambi- "about" (see ambi-) + PIE *kwol-o-, from root *kwel- (1) "revolve, move round."
and (conj.) Look up and at Dictionary.com
Old English and, ond, originally meaning "thereupon, next," from Proto-Germanic *unda (source also of Old Saxon endi, Old Frisian anda, Middle Dutch ende, Old High German enti, German und, Old Norse enn), from PIE root *en "in."

Introductory use (implying connection to something previous) was in Old English. To represent vulgar or colloquial pronunciation often written an', 'n'. Phrase and how as an exclamation of emphatic agreement dates from early 1900s.
Andalusia Look up Andalusia at Dictionary.com
former name of southern Spain, from Spanish, from al Andalus, Arabic name for the entire peninsula, which probably is from Late Latin *Vandalicia "the country of the Vandals" (see vandal) in reference to the Germanic tribe that, with others, overran the Western Empire 3c.-4c., and for a time settled in southern Spain. See vandal. Related: Andalusian.
andante (adj., n.) Look up andante at Dictionary.com
musical direction, "moderately slow," 1742, from Italian andante, suggesting "walking," present participle of andare "to go," from Vulgar Latin ambitare (source of Spanish andar "to go"), from Latin ambitus, past participle of ambire "to go round, go about," from amb- "around" (see ambi-) + ire "go" (from PIE root *ei- "to go").
Andes Look up Andes at Dictionary.com
great mountain system along the Pacific coast of South America, from Quechua andi "high crest." Related: Andean.
andiron (n.) Look up andiron at Dictionary.com
"fire-dog, one of the pair of metallic stands used to support wood burned on an open hearth," c. 1300, from Old French andier "andiron," which is of unknown origin, perhaps from Gaulish *andero- "a young bull" (source also of Welsh anner "heifer"), which would make sense if they once had bull's heads cast onto them. Altered by influence of Middle English iren (see iron (n.)).
Andorra Look up Andorra at Dictionary.com
small republic in the Pyrenees between France and Spain, probably from indigenous (Navarrese) andurrial "shrub-covered land." Related: Andorran.
andouille (n.) Look up andouille at Dictionary.com
type of sausage, c. 1600, from French andoille "sausage" (12c.), from Latin inductilia, neuter plural of inductilis, from inducere "to load or put in" (see induct). The original notion was perhaps of the filling "introduced" into the sausage.
Andrew Look up Andrew at Dictionary.com
masc. proper name, from Old French Andreu (Modern French André), from Late Latin Andreas (source also of Spanish Andrés, Italian Andrea, German Andreas, Swedish and Danish Anders), from Greek Andreas, a personal name equivalent to andreios (adj.) "manly, masculine, of or for a man; strong; stubborn," from aner (genitive andros) "man" (see anthropo-).

Nearly equivalent to Charles. Andrew Millar (1590s) for some forgotten reason became English naval slang for "government authority," and especially "the Royal Navy." St. Andrew (feast day Nov. 30) has long been regarded as patron saint of Scotland; the Andrew's cross (c. 1400) supposedly resembles the one on which he was crucified.
andro- Look up andro- at Dictionary.com
word-forming element meaning "man, male, masculine," from Greek andro-, comb. form of aner (genitive andros) "a man, a male" (as opposed to a woman, a youth, or a god), from PIE root *ner- (2) "man," also "vigorous, vital, strong" (source also of Sanskrit nar-, Armenian ayr, Welsh ner).

Equivalent to Latin vir (see virile). Sometimes in later use equivalent to anthropos, Latin homo "a person, a human being," and the compounds in it often retain this genderless sense (e.g. androcephalous "having a human head," said of monsters including the Sphinx, which in Greece was female).
androcentric (adj.) Look up androcentric at Dictionary.com
"having males as the center," 1887, from andro- "man, male" + -centric.
androcentricity (n.) Look up androcentricity at Dictionary.com
1907; see androcentric + -ity.
androcentrism (n.) Look up androcentrism at Dictionary.com
1915; see androcentric + -ism.
androcracy (n.) Look up androcracy at Dictionary.com
"rule or supremacy of men," 1883; see andro- "man, male" + -cracy "rule or government by." Related: Androcratic.
androgen (n.) Look up androgen at Dictionary.com
"male sex hormone," 1936, from andro- "man, male" + -gen "thing that produces or causes."
androgyne (n.) Look up androgyne at Dictionary.com
"a hermaphrodite," mid-12c., from Medieval Latin androgyne (fem.), from Greek androgynos "a hermaphrodite, a woman-man" (see androgynous). Related: Androgynism.
androgynous (adj.) Look up androgynous at Dictionary.com
1620s, "womanish" (of a man); 1650s, "having two sexes, being both male and female," from Latin androgynus, from Greek androgynos "hermaphrodite, male and female in one; womanish man;" as an adjective (of baths) "common to men and women," from andros, genitive of aner "male" (see anthropo-) + gyne "woman" (see queen). Related: Androgynal (1640s).
androgyny (n.) Look up androgyny at Dictionary.com
"state of being androgynous, union of sexes in one individual," 1833; see androgynous.
android (n.) Look up android at Dictionary.com
"automaton resembling a human being in form and movement," 1837, in early use often in reference to automated chess players, from Modern Latin androides (itself attested as a Latin word in English from 1727), from Greek andro- "man" (see andro-) + -eides "form, shape" (see -oid). Greek androdes meant "like a man, manly;" compare also Greek andrias "image of a man, statue." Listed as "rare" in OED 1st edition (1879), popularized from c. 1950 by science fiction writers.
Andromache Look up Andromache at Dictionary.com
wife of Hector, Latin Andromache, from Greek Andromakhe, perhaps literally "whose husband excells in fighting," fem. of andromakhos "fighting with men;" see anthropo- + -machy.
Andromeda Look up Andromeda at Dictionary.com
northern constellation, 1667 (earlier Andromece, mid-15c.), from Greek, literally "mindful of her husband," from andros, genitive of aner "man" (see anthropo-) + medesthai "to be mindful of, think on," related to medea (neuter plural) "counsels, plans, devices, cunning" (and source of the name Medea). In classical mythology the daughter of Cepheus and Cassiopeia, she was bound to a rock to be destroyed by the sea monster Cetus, but was rescued by Perseus, mounted on Pegasus. The whole group was transferred to the Heavens (except the rock).
andron (n.) Look up andron at Dictionary.com
men's apartment in a house, from Greek andron, collateral form of andronitis "men's apartment," from aner (genitive andros) "man" (see anthropo-). The female equivalent was a gynaeceum.
androphagous (adj.) Look up androphagous at Dictionary.com
"man-eating," 1847; see andro- "man" + -phagous "eating."
androphobia (n.) Look up androphobia at Dictionary.com
"morbid fear of the male sex" (sometimes, rather, "of the human race" or "of crowds"), 1844, from andro- "man, male" + -phobia. Related: Androphobic.
Andy Look up Andy at Dictionary.com
familiar shortening of masc. proper name Andrew (q.v.).
anear (adv.) Look up anear at Dictionary.com
"nearly," c. 1600, from a- (1) + near (adv.). Meaning "close by" (opposite of afar) is from 1798. As a preposition, "near to," 1732.
anecdotage (n.) Look up anecdotage at Dictionary.com
1823, "anecdotes collectively," from anecdote + -age. As a jocular coinage meaning "garrulous old age" it is recorded from 1835, and spawned anecdotard (1894).
anecdotal (adj.) Look up anecdotal at Dictionary.com
"pertaining to anecdotes, of the nature of an anecdote," 1794, from anecdote + -al (1). Related: Anecdotally. Anecdotical is attested from 1744.
anecdote (n.) Look up anecdote at Dictionary.com
1670s, "secret or private stories," from French anecdote (17c.) or directly from Medieval Latin anecdota, from Greek anekdota "things unpublished," neuter plural of anekdotos, from an- "not" (see an- (1)) + ekdotos "published," from ek- "out" (see ex-) + didonai "to give" (from PIE root *do- "to give").

Procopius' 6c. Anecdota, unpublished memoirs of Emperor Justinian full of court gossip, gave the word a sense of "revelation of secrets," which decayed in English to "brief, amusing story" (1761).
anechoic (adj.) Look up anechoic at Dictionary.com
1948, in electronics, from an- (1) "not" + echoic.
anemia (n.) Look up anemia at Dictionary.com
"deficiency of blood in a living body," alternative (chiefly U.S.) spelling of anaemia (q.v.); also see æ (1). As a genus of plants, Modern Latin, from Greek aneimon "unclad," from an- "without" (see an- (1)) + eima "a dress, garment" (see wear (v.)).
anemic (adj.) Look up anemic at Dictionary.com
"affected with anemia, deficient in blood," alternative (chiefly U.S.) spelling of anaemic (q.v.); also see æ (1).
anemo- Look up anemo- at Dictionary.com
before vowels anem-, word-forming element meaning "wind," from Greek anemos "wind," from PIE root *ane- "to breathe."
anemometer (n.) Look up anemometer at Dictionary.com
"wind-gage, instrument for indicating the velocity of the wind," 1727, from anemo- "wind" + -meter. Related: Anemometry; anemometric.
anemone (n.) Look up anemone at Dictionary.com
flowering plant genus, 1550s, from Middle French anemone (16c., corrected from Old French anemoine) and directly from Latin anemone, from Greek anemone "wind flower," literally "daughter of the wind," from anemos "wind" (cognate with Latin anima, from PIE root *ane- "to breathe") + -one feminine patronymic suffix.

According to Asa Gray it was so called because it was thought to open only when the wind blows. Klein suggests the flower name perhaps originally is from Hebrew (compare na'aman, in nit'e na'amanim, literally "plants of pleasantness," in Isaiah xvii.10, from na'em "was pleasant"). In zoology, applied to a type of sea creature (sea anemone) from 1773. Related: Anemonic.
anencephalic (adj.) Look up anencephalic at Dictionary.com
"having no brain" (biology), 1821, with -ic + Latinized form of Greek anenkephalos, from an- "not, without" (see an- (1)) + enkephalos "brain," "the brain," literally "within the head," from en "in" (see en- (2)) + kephale "head;" see cephalo-. Related: Anencephalous (1834); anencephalia; anencephaly.
anent (prep.) Look up anent at Dictionary.com
"concerning, about, in respect or reference to," c. 1200, onont "on level with, beside," also "in the company of, fronting against," a contraction of Old English on efn "near to, close by," literally "on even (ground with);" see a- (1) + even (adj.).

Sometimes anents, with adverbial genitive. The unetymological -t was added 12c. Compare German neben "near to, by the side of," short for in eben, from Old High German ebani "equality."
anesthesia (n.) Look up anesthesia at Dictionary.com
1721, "loss of feeling," medical Latin, from Greek anaisthesia "want of feeling or perception, lack of sensation (to pleasure or pain)," abstract noun from an- "without" (see an- (1)) + aisthesis "feeling," from PIE root *au- (4) "to perceive" (see audience). For the abstract noun ending, see -ia. As "a procedure for the prevention of pain in surgical operations," from 1846. Aesthesia "capacity for feeling" is attested in English from 1853, perhaps a back-formation.
anesthesiologist (n.) Look up anesthesiologist at Dictionary.com
1943, American English, from anesthesiology + -ist.
anesthesiology (n.) Look up anesthesiology at Dictionary.com
1908, from anesthesia + -ology.
Anesthesiology. This is the new term adopted by the University of Illinois defining "the science that treats of the means and methods of producing in man or animal various degrees of insensibility with or without hypnosis." ["Medical Herald," January, 1912]
anesthetic (adj.) Look up anesthetic at Dictionary.com
1846, "insensible;" 1847, "producing temporary loss of sensation," with -ic + Latinized form of Greek anaisthetos "insensate, without feeling; senseless, tactless, stupid" (see anesthesia). Noun meaning "agent that produces anesthesia" first used in modern sense 1848 by Scottish doctor James Young Simpson (1811-1870), pioneer in the surgical use of chloroform.
anesthetist (n.) Look up anesthetist at Dictionary.com
"one who administers anesthetics," 1861, from stem of anesthesia + -ist.
anesthetize (v.) Look up anesthetize at Dictionary.com
"bring under the influence of an anesthetic," 1848, from Latinized form of Greek anaisthetos "insensate, without feeling" (see anesthesia) + -ize. Related: Anesthetized; anesthetizing; anesthetization.
aneuploidy (n.) Look up aneuploidy at Dictionary.com
abnormal number of chromosomes, 1934, from adjective aneuploid (1931), Modern Latin, coined 1922 by G. Täckholm from Greek an- "not, without" (see an- (1)) + euploid, from Greek eu "well, good" (see eu-) + -ploid, from -ploos "fold" (see -plus).
aneurism (n.) Look up aneurism at Dictionary.com
the less correct, but more popular, spelling of aneurysm (q.v.), by influence of words in -ism. The -y- is etymologically correct; the spelling with -i- suggests a meaning "nervelessness."
aneurysm (n.) Look up aneurysm at Dictionary.com
"dilation of an artery," early 15c., from Medieval Latin aneurisma, from Greek aneurysmos "dilation," from aneurynein "to dilate," from ana "up" (see ana-) + eurynein "widen," from eurys "broad, wide" (see eury-). Related: Aneurysmal; aneurysmic.
anew (adv.) Look up anew at Dictionary.com
"over again, once more, afresh," c. 1300, a neue, from Old English of-niowe; see a- (1) + new. One-word form dominant from c. 1400.
anext (adv.) Look up anext at Dictionary.com
"next to," c. 1400, from a- (1) + next.
anfractuous (adj.) Look up anfractuous at Dictionary.com
1620s, "full of windings and turnings," from Latin anfractuosus "roundabout, winding," from anfractus "a winding, turning, a bending round," especially "a circuitous route," also figuratively, in rhetoric, "circumlocution," from am(bi)- "around" (see ambi-) + fractus, past participle of frangere "to break" (from PIE root *bhreg- "to break"). T.S. Eliot uses it in the French sense "craggy," which probably he got from Laforgue. Related: Anfractuosity (1590s).
angel (n.) Look up angel at Dictionary.com
"one of a class of spiritual beings, attendants and messengers of God," a c. 1300 fusion of Old English engel (with hard -g-) and Old French angele. Both are from Late Latin angelus, from Greek angelos, literally "messenger, envoy, one that announces," in the New Testament "divine messenger," which is possibly related to angaros "mounted courier," both from an unknown Oriental word (Watkins compares Sanskrit ajira- "swift;" Klein suggests Semitic sources). Used in Scriptural translations for Hebrew mal'akh (yehowah) "messenger (of Jehovah)," from base l-'-k "to send." An Old English word for it was aerendgast, literally "errand-spirit."

Of persons, "one who is loving, gracious, or lovely," by 1590s. The medieval English gold coin (a new issue of the noble, first struck 1465 by Edward VI) was so called for the image of archangel Michael slaying the dragon, which was stamped on it. It was the coin given to patients who had been "touched" for the King's Evil. Angel food cake is from 1881; angel dust "phencyclidine" is from 1968.