n.
Pronunciation: ' his-t ə - ˌ m ē n, -m ə n
Function: noun
Etymology: International Scientific Vocabulary hist- + amine
Date: circa 1913
: a compound C 5 H 9 N 3 especially of mammalian tissues that causes dilation of capillaries, contraction of smooth muscle, and stimulation of gastric acid secretion, that is released during allergic reactions, and that is formed by decarboxylation of histidine