Online Etymology Dictionary

antidote (n.): "remedy counteracting poison," 1510s (earlier in English as a Latin word), from Middle French antidot and directly from Latin antidotum "a remedy against poison," from Greek antidoton "given as a remedy," literally "given against," verbal adjective of antididonai "give in return," from anti- "against" + didonai "to give" (see date (n.1)). Compare Middle English antidotarie "treatise on drugs or medicines" (c. 1400).
Antietam: place name, eastern U.S., from an Algonquian word perhaps meaning "swift water;" the name occurrs in Pennsylvania and Ohio, but the best-known is a creek near Sharpsburg in Washington County, Maryland, site of a bloody Civil War battle Sept. 17, 1862.
antifebrile: 1660s, from anti- + febrile.
antigen (n.): "substance that causes production of an antibody," 1908, from German Antigen, from French antigène (1899), from anti- (see anti-) + Greek -gen (see -gen).
Antigone: daughter of Oedipus, her name may mean "in place of a mother" in Greek, from anti- "opposite, in place of" (see anti-) + gone "womb, childbirth, generation," from root of gignesthai "to be born" related to genos "race, birth, descent" (see genus).
Antigua: Caribbean island, from Spanish fem. of antiguo, literally "ancient, antique" (see antique); discovered by Columbus in 1493 and named by him for the church of Santa Maria la Antigua ("Old St. Mary's") in Seville.
antihero (n.): also anti-hero; 1714, from anti- + hero.
antihistamine (n.): 1933, from anti- + histamine.
antimatter (n.): also anti-matter, 1953, from anti- + matter (n.).
antimetabole (n.): 1590s, from Greek antimetabole, from anti- "opposite" (see anti-) + metabole "turning about" (see metabolism).
antimony (n.): brittle metallic element, early 15c., from Old French antimoine and directly from Medieval Latin antimonium, an alchemist's term (used 11c. by Constantinus Africanus), origin obscure, probably a Latinization of Greek stimmi "powdered antimony, black antimony" (a cosmetic used to paint the eyelids), from some Arabic word (such as al 'othmud), unless the Arabic word is from the Greek or the Latin is from Arabic; probably ultimately from Egyptian stm "powdered antimony." In French folk etymology, anti-moine "monk's bane" (from moine).

As the name of a pure element, it is attested in English from 1788. Its chemical symbol Sb is for Stibium, the Latin name for "black antimony," which word was used also in English for "black antimony."
antinode (n.): 1872, from anti- + node.
antinomian (n.): "one who maintains the moral law is not binding on Christians under the law of grace," 1640s, from Medieval Latin Antinomi, name given to a sect of this sort that arose in Germany in 1535, from Greek anti- "opposite, against" (see anti-) + nomos "rule, law" (see numismatic).
antinomianism (n.): 1640s, from antinomian + -ism.
antinomy (n.): 1590s, "contradiction in the laws," from Latin antinomia, from Greek antinomia "ambiguity in the law," from anti- "against" (see anti-) + nomos "law" (see numismatics). As a term in logic, from 1802 (Kant).
Antioch: modern Antakya in Turkey, anciently the capital of Syria, founded c. 300 B.C.E. by Seleucus I Nictor and named for his father, Antiochus.
antioxidant: 1920 (n.); 1932 (adj.), from anti- + oxidant.
antipasto (n.): 1934, from Italian antipasto, from anti- "before" (see ante) + pasto "food," from Latin pascere "to feed" (see pastor). Earlier Englished as antepast (1590).
antipathetic (adj.): 1630s "having an antipathy for," from an adjectival construction from Greek antipathein (see antipathy). Related: antipathetical (c. 1600); antipathetically.
antipathic (adj.): 1830, from French antipathique; see antipathy + -ic. It tends to be used in medicine in place of antipathetic.
antipathy (n.): c. 1600, from Latin antipathia, from Greek antipatheia, noun of state from antipathes "opposed in feeling, having opposite feeling; in return for suffering; felt mutually," from anti- "against" (see anti-) + root of pathos "feeling" (see pathos).
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," from PIE root *bha- (2) "to speak, tell, say" (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," from PIE root *ped- (1) "a 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," from PIE root *paəwr- "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 put, place" (see theme).
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.