Definition of antihistamine noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.
antihistamine meaning, definition, what is antihistamine: a drug that is used to treat an allergy ...: Learn more.
word-forming element of Greek origin meaning "against, opposed to, opposite of, instead," shortened toant-before vowels and-h-, from Old Frenchanti-and directly from Latinanti-, from Greekanti(prep.) "over, against, opposite; instead, in the place of; as good as; at the price of; fo...