|a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.|
|a chattering or flighty, light-headed person.|
alpha-adrenergic receptor n.
Any of various cell membrane receptors that can bind with norepinephrine and related substances that activate or block the actions of the cells containing such receptors; these cells initiate physiological responses such as vasoconstriction, pupil dilation, and contraction of pilomotor muscles. Also called alpha-receptor.