Source : Webster's Revised Unabridged Dictionary (1913)

Nauseant \Nau"se*ant\, n. [L. nauseans, p. pr. Of nauseare.]
   (Med.)
   A substance which produces nausea.

Source : WordNet®

nauseant
     n : a medicine that induces nausea and vomiting [syn: {emetic},
         {vomit}, {vomitive}]