Main Entry: an·ti·his·ta·mine

Pronunciation: \-ˈhis-tə-ˌmēn, -mən\

Function: noun

Date: 1946

: any of various compounds that counteract histamine in the body and that are used for treating allergic reactions (as hay fever) and cold symptoms

— antihistamine adjective

— an·ti·his·ta·min·ic \-ˌhis-tə-ˈmi-nik\ adjective or noun