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Definition of: antihistamine
(an′ti·his′tə·mēn, -min) noun
Med. Any of certain drugs which neutralize the vasoconstrictor action of histamine in the body: used especially in the treatment of allergic conditions, as hay fever, asthma, etc., and of thecommon cold.
—an′ti·his′ta·min′ic (-min′ik) adjective
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