Bull, a. Of or pertaining to a bull; resembling a bull; male; large; fierce.
 Bull bat Zool., 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 Zool., the chub mackerel.
 Bull pump Mining, a direct single-acting pumping engine, in which the steam cylinder is placed above the pump.
 Bull snake Zool., 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.