antidote
an.ti.dote \'ant-i-.do-t\ n [ME antidot, fr. L antidotum, fr. Gk antidotos, fr. fem. of (Xantidotos given as an antidote, fr. antididonai to give as an antidote, fr. anti- + didonai to give - more at DATE 1: a remedy to counteract the effects of poison 2: something that relieves, prevents, or counteracts