antidote (n.) Look up antidote at
"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" (see anti-) + didonai "to give" (see date (n.1)). Compare Middle English antidotarie "treatise on drugs or medicines" (c. 1400).