Clinker

·noun A scale of oxide of iron, formed in forging.

II. Clinker ·noun A kind of brick. ·see Dutch clinker, under Dutch.

III. Clinker ·noun A mass composed of several bricks run together by the action of the fire in the kiln.

IV. Clinker ·noun Scoria or vitrified incombustible matter, formed in a grate or furnace where anthracite coal in used; vitrified or burnt matter ejected from a volcano; slag.