antidote

From Latin antidotum, from Ancient Greek ἀντίδοτον (antídoton, “antidote, remedy”), Clipping of ἀντίδοτον φάρμακον (antídoton phármakon, “drug given against”), from ἀντιδίδωμι (antidídōmi, “to give in return, repay”), from ἀντί (antí, “against”) + δίδωμι (dídōmi, “to give”). Compare French antidote.