Definition

To be in heat; to manifest sexual desire as cows do. [Colloq.]

Other Definitions

This word also has 2 other definitions:

BULL (adjective)

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 ...

BULL (noun)

1. The male of any species of cattle (Bovidæ); hence, the male of any large quadruped, as the elephant; also, the male of the whale. 2. One who, or t...