his·ta·mine (h s t -m n , -mn)n. A physiologically active amine, C5H9N3, found in plant and animal tissue and released from mast cells as part of an allergic reaction in humans. It stimulates gastric secretion and causes dilation of capillaries, constriction of bronchial smooth muscle, and decreased blood pressure. [hist(idine) + amine.] his ta·minic (-mnk) adj. |
histamine [hiss-ta-meen]
Noun
a chemical compound released by the body tissues in allergic reactions [Greek histos tissue + amine]
| histamine (hst-mn) An organic compound found widely in animals and plants that in humans and other mammals is released as part of the body's immune response, causing physiological changes including dilation of the blood vessels, contraction of smooth muscle (as in the airways), and increased gastric acid secretion. The itching and sneezing typical of respiratory allergies are caused by the release of histamine. Chemical formula: C5H9N3 |
ThesaurusLegend: Synonyms Related Words Antonyms
| Noun | 1. | histamine - amine formed from histidine that stimulates gastric secretions and dilates blood vessels; released by the human immune system during allergic reactions amine, aminoalkane - a compound derived from ammonia by replacing hydrogen atoms by univalent hydrocarbon radicals |
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