histamine: Meaning and Definition of


Pronunciation: (his'tu-mēn", -min), [key]
— n.
  1. 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.
  2. a commercial form of this compound, obtained from histidine and used chiefly in the diagnosis of gastric and circulatory functions. Cf. antihistamine.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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