Definitions for histamineˈhɪs təˌmin, -mɪn
Random House Webster's College Dictionary
his•ta•mineˈhɪs təˌmin, -mɪn(n.)
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.
Origin of histamine:
1910–15; hist (idine ) +amine
amine formed from histidine that stimulates gastric secretions and dilates blood vessels; released by the human immune system during allergic reactions
An amine, CHN, formed by decarboxylation of histidine, that causes dilatation of capillaries, contraction of smooth muscle, and stimulation of gastric acid secretion; it is released during allergic reactions.
Origin: From histidine + amine.
U.S. National Library of Medicine
An amine derived by enzymatic decarboxylation of HISTIDINE. It is a powerful stimulant of gastric secretion, a constrictor of bronchial smooth muscle, a vasodilator, and also a centrally acting neurotransmitter.