|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|
|a period of sleep during which most dreaming occurs as the eyes move under closed lids and the skeletal muscles are deeply relaxed|
antagonist an·tag·o·nist (ān-tāg'ə-nĭst)
Something, such as a muscle, disease, or physiological process, that neutralizes or impedes the action or effect of another.
|antagonist (ān-tāg'ə-nĭst) Pronunciation Key