bright star in Scorpio, from Greek Antares, contracted from anti Ares "rival of Mars," in reference to its red color, which resembles that of Mars. See anti- + Ares. In Middle English, Cor Scorpionis (late 14c.).
word-forming element of Greek origin meaning "against, opposed to, opposite of, instead," shortened to ant- before vowels and -h-, from Old French anti- and directly from Latin anti-, from Greek anti (prep.) "over, against, opposite; instead, in the place of; as good as; at the price of; for the sake of; compared with; in opposition to; in return; counter-," from PIE *anti "against," also "in front of, before" (from root *ant- "front, forehead," with derivatives meaning "in front of, before"), which became anti- in Italian (hence antipasto) and French.
It is cognate with Sanskrit anti "over, against," and Old English and- (the first element in answer). A common compounding element in Greek, in some combinations it became anth- for euphonic reasons. It appears in some words in Middle English but was not commonly used in English word formations until modern times. In a few English words (anticipate, antique) it represents Latin ante.
In noun compounds where it has the sense of "opposed to, opposite" (Antichrist, anti-communist) the accent remains on the anti-; in adjectives where it retains its old prepositional sense "against, opposed to," the accent remains on the other element (anti-Christian, anti-slavery).
Greek god of war in all its violence, brutality, confusion, and destruction; identified by Romans with their Mars; literally "injurer, destroyer," from are "bane, ruin," and perhaps cognate with Sanskrit irasya "ill-will" (see ire).
<a href="https://www.etymonline.com/word/antares">Etymology of antares by etymonline</a>
Harper, D. (n.d.). Etymology of antares. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/antares