n. An animal which breaks away from the herd, and runs wild in the scrub, generally coming out at night to feed in the open; in the plural, scrub-cattle.n. One who scrubs; specifically, one of a scrub-gang aboard ship.n. A scrubbing-brush.n. An apparatus for freeing coal-gas from tarry impurities and ammonia.n. In leather manufacturing, a machine for washing leather after it comes from the tan-pits.