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| 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 |
| physically fitted to live; a fetus having reached such a stage of development as to be capable of living, under normal conditions, outside the uterus |
systaltic sys·tal·tic (sĭ-stôl'tĭk, -stāl'-)
adj.
Alternately contracting and dilating, as the heart; pulsating.