Online Etymology Dictionary

antiperspirant (adj.): by 1946, from anti- + perspire + adjectival suffix -ant.
antiphon (n.): c.1500, "a versicle sung responsively," from Middle French antiphone "hymn" or directly from Medieval Latin antiphona, from Greek antiphona, from anti- "over against" (see anti-) + phone "voice" (see fame (n.)). A re-adoption of the word which had become anthem in English and lost its original meaning.
antiphonal (adj.): 1719, from antiphon + -al. Related: Antiphonally.
antiphony (n.): 1590s, from Greek antiphonos (see antiphon) + -y (1).
antiphrasis (n.): 1530s, from Latin antiphrasis, from Greek antiphrasis, from antiphrazein "to express (something) by the opposite," from anti- (see anti-) + phrazein "to consider, to express" (see phrase (n.)).
antipodes (n.): late 14c., "persons who dwell on the opposite side of the globe;" 1540s as "place on the opposite side of the earth," from Latin antipodes "those who dwell on the opposite side of the earth," from Greek antipodes, plural of antipous "with feet opposite (ours)," from anti- "opposite" (see anti-) + pous "foot" (see foot (n.)); thus, people who live on the opposite side of the world.
Yonde in Ethiopia ben the Antipodes, men that haue theyr fete ayenst our fete. ["De Proprietatibus Rerum Bartholomeus Anglicus," translated by John of Trevisa, 1398]
Not to be confused with antiscii "those who live on the same meridian on opposite side of the equator," whose shadows fall at noon in the opposite direction, from Greek anti- + skia "shadow." Related: Antipodal (adj.); antipodean (1630s, n.; 1650s, adj.).
antipope (n.): also anti-pope, early 15c. (mid-13c. in Anglo-Latin), from Medieval Latin antipapa, from Greek anti- "against" (see anti-) + papa (see pope).
antipyretic: "reducing fever; that which reduces fever," 1680s, from anti- + Greek pyretos "fever, burning heat," related to pyr "fire" (see fire (n.)) + -ic.
antiquarian (n.): "one who studies or is fond of antiquities," c.1600, from Latin antiquarius "pertaining to antiquity," from antiquus (see antique (adj.)) + -an. As an adjective from 1771.
antiquated (adj.): 1620s, past participle adjective from antiquate (1530s) "to make old or obsolete," from Latin antiquatus, past participle of antiquare (see antique (adj.)). An older adjective in the same sense was antiquate (early 15c.), from Latin.
antiquation (n.): 1640s, from Late Latin antiquationem (nominative antiquatio), noun of action from past participle stem of antiquare (see antique (adj.)).
antique (adj.): 1530s, "aged, venerable," from Middle French antique "old" (14c.), from Latin antiquus (later anticus) "ancient, former, of olden times; old, long in existence, aged; venerable; old-fashioned," from PIE *anti in sense of "before" (see ante) + *okw- "appearance" (see eye (n.)). Originally pronounced in English like its parallel antic, but French pronunciation and spelling were adopted from c.1700.
antique (n.): "an old and collectible thing," 1771, from antique (adj.).
antique (v.): "to give an antique appearance to," 1896, from antique (adj.). Related: Antiqued; antiquing.
antiquity (n.): late 14c., "olden times," from Old French antiquitet (11c.; Modern French antiquité) "olden times; great age; old age," from Latin antiquitatem (nominative antiquitas) "ancient times, antiquity, venerableness," noun of quality from antiquus (see antique (adj.)). Specific reference to ancient Greece and Rome is from mid-15c.; meaning "quality of being old" is from about the same time. Antiquities "relics of ancient days" is from 1510s.
antiscorbutic (n.): also anti-scorbutic, 1690s, from anti- + Modern Latin scorbutus "scurvy" (see scorbutic). From 1725 as an adjective.
antiseptic (adj.): 1750, coined from anti- "against" + septic. Figurative use by 1820. As a noun meaning "an antiseptic substance" by 1803.
antistrophe (n.): c.1600, from Latin, from Greek antistrophe "a turning about, a turning back," from antistrephein, from anti- "against" (see anti-) + strephein "to turn" (see strophe).
antitheism (n.): also anti-theism, 1788; see anti- + theism.
antitheist (n.): also anti-theist, "one opposed to belief in the existence of a god," 1813; see anti- + theist. Related: Antitheistic.
antitheses (n.): plural of antithesis.
antithesis (n.): 1520s, from Late Latin antithesis, from Greek antithesis "opposition, resistance," literally "a placing against," also a term in logic and rhetoric, noun of action from antitithenai "to set against, oppose," a term in logic, from anti- "against" (see anti-) + tithenai "to place," from PIE root *dhe- "to put, to do" (see factitious).
antithetic (adj.): "containing an antithesis," c.1600, from Greek antithetikos "setting in opposition," from antithetos "placed in opposition," from antithesis (see antithesis).
antithetical (adj.): 1580s, from Greek antithetikos "setting in opposition," from antithetos "placed in opposition" (see antithetic) + -al (1). Related: Antithetically.
antitoxic: 1860 (n.); 1862 (adj.), from anti- + toxic.
antitoxin (n.): "substance neutralizing poisons," 1892, from anti- + toxin. Coined in 1890 by German bacteriologist Emil von Behring (1854-1917). Antitoxic in this sense is from 1860.
antitrust (adj.): also anti-trust, 1890, U.S., from anti- + trust (n.) in the economic monopoly sense.
antitype (n.): also anti-type, 1610s, from Greek antitypos "corresponding in form," literally "struck back, responding as an impression to a die," from anti- (see anti-) + typos "a blow, mark" (see type (n.)).
antivenin (n.): 1894, from anti- + venin, from venom + chemical suffix -in (2). Perhaps immediately from French antivenin.
antivirus (n.): 1903, from anti- + virus.
antler (n.): late 14c., from Anglo-French auntiler, Old French antoillier (14c., Modern French andouiller) "antler," perhaps from Gallo-Romance cornu *antoculare "horn in front of the eyes," from Latin ante "before" (see ante) + ocularis "of the eyes" (see ocular). This etymology is doubted by some because no similar word exists in any other Romance language, but cf. German Augensprossen "antlers," literally "eye-sprouts," for a similar formation.
Antonia: fem. proper name, from Latin Antonia, fem. of Antonius (see Anthony).
Antonine (adj.): 1680s, in reference to Roman emperors Antoninus Pius (ruled 138-161 C.E.) and Marcus Aurelius Antoninus (161-180).
antonomasia (n.): use of an epithet for a proper name (or vice versa; e.g. His Holiness for the name of a pope), 1580s, from Latin, from Greek antonomasia, from antonomazein "to name instead, call by a new name," from anti "instead" (see anti-) + onomazein "to name," from onoma "name" (see name (n.)).
Antony: masc. proper name, from Latin Antonius, name of a Roman gens (see Anthony).
antonym (n.): 1867, coined to serve as opposite of synonym, from Greek anti- "equal to, instead of, opposite" (see anti-) + -onym "name" (see name (n.)). Perhaps introduced to English in the book "Synonyms and Antonyms" (1867) by the Ven. C.J. Smith, M.A.
UNDER the head of Synonyms and Antonyms, Archdeacon Smith arranges words which form an antithesis to one another. The word "antonym" is, we believe, a new formation but useful. ["Journal of Sacred Literature," July 1867]
French antonyme (1842), German antonym (by 1859) are older. The un-Greek alternative counterterm has been left to fade.
antrum (n.): "a cave or cavity," late 14c., medical Latin, from Greek antron "cave."
antsy (adj.): 1838, American English, from plural of ant + -y (2); probably reflecting the same image as the slang expression have ants in (one's) pants "be restless and fidgety" from a century later. Related: Antsiness.
Antwerp: port city in Belgium, French Anvers, from a Germanic compound of *anda "at" + *werpum "wharf" (see wharf). Folk etymology connects the first word with hand.
Anubis: jackal-headed god of Egyptian religion, from Greek Anoubis, from Egyptian Anpu.
anuria (n.): 1838, medical Latin, from Greek an-, privative prefix (see an- (1)), + ouron "urine" (see urine).
anus (n.): "inferior opening of the alimentary canal," 1650s, from Old French anus, from Latin anus "ring, anus," from PIE root *ano- "ring." So called for its shape; cf. Greek daktylios "anus," literally "ring (for the finger)," from daktylos "finger."
anvil (n.): Old English anfilt, a West Germanic compound (cf. Middle Dutch anvilt, Old High German anafalz, Dutch aanbeeld, Danish ambolt "anvil") from *ana- "on" + *filtan "hit" (see felt (n.)). The ear bone so called from 1680s. Anvil Chorus is based on the "Gypsy Song" that opens Act II of Giuseppe Verdi's opera "Il Trovatore," first performed in Teatro Apollo, Rome, Jan. 19, 1853.
anxiety (n.): 1520s, from Latin anxietatem (nominative anxietas) "anguish, anxiety, solicitude," noun of quality from anxius (see anxious). Psychiatric use dates to 1904. Age of Anxiety is from Auden's poem (1947). For "anxiety, distress," Old English had angsumnes, Middle English anxumnesse.
anxious (adj.): 1620s, from Latin anxius "solicitous, uneasy, troubled in mind" (also "causing anxiety, troublesome"), from angere, anguere "choke, squeeze," figuratively "torment, cause distress" (see anger (v.)). The same image is in Serbo-Croatian tjeskoba "anxiety," literally "tightness, narrowness." Related: Anxiously; anxiousness.
any (adj.): Old English ænig "any, anyone," literally "one-y," from Proto-Germanic *ainagas (cf. Old Saxon enig, Old Norse einigr, Old Frisian enich, Dutch enig, German einig), from PIE *oi-no- "one, unique" (see one). The -y may have diminutive force here.

Emphatic form any old ______ (British variant: any bloody ______) is recorded from 1896. At any rate is recorded from 1847. Among the large family of compounds beginning with any-, anykyn "any kind" (c.1300) did not survive, and Anywhen (1831) is rarely used, but OED calls it "common in Southern [British] dialects."
anybody (n.): c.1300, ani-bodi, from any + body. One-word form is attested by 1826. Phrase anybody's game (or race, etc.) is from 1840.
anyhow (adv.): 1740, from any + how (adv.). Unlike the cases of most other any + (interrogative) compounds, there is no record of it in Old or Middle English. Emphatic form any old how is recorded from 1900, American English.
anymore (adv.): one-word form by 1865, from any + more.
anyone (n.): Old English, two words, from any + one. Old English also used ænigmon in this sense. One-word form from 1844.