Webster's English Dictionary

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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