histamine: Meaning and Definition of
Pronunciation: (his'tu-mēn", -min), [key]
- a histidine-derived amine compound that is released mainly by damaged mast cells in allergic reactions, causing dilation and permeability of blood vessels and lowering blood pressure.
- a commercial form of this compound, obtained from histidine and used chiefly in the diagnosis of gastric and circulatory functions. Cf. antihistamine.
- histamine (Thesaurus)