MOLE (3)

Mole, n. [[F. môle, L. moles. Cf. Demolish, Emolument, Molest.]] A mound or massive work formed of masonry or large stones, etc., laid in the sea, often extended either in a right line or an arc of a circle before a port which it serves to defend from the violence of the waves, thus protecting ships in a harbor; also, sometimes, the harbor itself. Brande & C.