A nauseant is a substance or an agent that is used to generate the tendency to vomit. Tobacco and egg white are nauseous to children, and produce sickness at the stomach. Nauseants are akin to direct emetics. ... Found on http://en.wikipedia.org/wiki/Nauseant
Nau'se·ant noun [ Latin nauseans , present participle Of nauseare .] (Medicine) A substance which produces nausea. Found on http://www.encyclo.co.uk/webster/N/6