I. noun 1. a medicine taken or given to counteract a particular poison. • there is no known antidote to the poison of the pufferfish.
2. something that counteracts an unpleasant feeling or situation • laughter is a good antidote to stress.
II. derivatives antidotal adjective
– origin late Middle English: via Latin, from Greek antidoton, neuter of antidotos ‘given against’, from anti- ‘against’ + didonai ‘give’.