Wordnet 3.0
NOUN (1)
1.
any medicine used to suppress or relieve coughing;
The Collaborative International Dictionary of English v.0.48:
antitussive \antitussive\ a.
1. having ability to to suppress or relieve coughing; -- of
chemical substances.
[WordNet 1.5 +PJC]
The Collaborative International Dictionary of English v.0.48:
antitussive \antitussive\ n.
1. a medicament used to suppress or relieve coughing; an
antitussive substance.
Note: Codeine is one such commonly used antitussive.
[WordNet 1.5 +PJC]
WordNet (r) 3.0 (2006):
antitussive
n 1: any medicine used to suppress or relieve coughing