Bull, a. Of or pertaining to a bull; resembling a bull; male; large; fierce.
Bull bat(Zoöl.), the night hawk; — so called from the loud noise it makes while feeding on the wing, in the evening. — Bull calf. (a) A stupid fellow. — Bull mackerel(Zoöl.), the chub mackerel. — Bull pump(Mining), a direct single-acting pumping engine, in which the steam cylinder is placed above the pump. — Bull snake(Zoöl.), the pine snake of the United States. — Bull stag, a castrated bull. See Stag. — Bull wheel, a wheel, or drum, on which a rope is wound for lifting heavy articles, as logs, the tools in well boring, etc.