Definition of Antiemetics

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Antiemetics: 1. As a noun, a drug taken to prevent or treat nausea and vomiting. As, for example, the antihistamine meclizine hydrochloride (Bonine).
2. As an adjective, pertaining to the prevention or treatment of nausea and vomiting. Opening a window in a car can have an antiemetic effect.
From anti- + emetic.