nauseant
/ˈnɔːsɪənt/ /ˈnɔːzɪənt/Chiefly Medicine
noun
A substance or agent which produces nausea.
adjective
Producing nausea; (in extended use) nauseating, extremely distasteful.
Origin
Early 19th century; earliest use found in The Lancet. From classical Latin nauseant-, nauseāns, use as adjective of present participle of nauseāre. With use as noun compare earlier nauseate, nauseity.