MORTAR

A strong vessel, commonly in form of an inverted bell, in which substances are pounded or rubbed with a pestle.

A short piece of ordnance, used for throwing bombs, carcasses, shells, etc., at high angles of elevation, as 45º, and even higher; - - so named from its resemblance in shape to the utensil above described. Mortar bed (Mil.), a framework of wood and iron, suitably hollowed out to receive the breech and trunnions of a mortar. -- Mortar boat or vessel (Naut.), a boat strongly built and adapted to carrying a mortar or mortars for bombarding; a bomb ketch. -- Mortar piece, a mortar. [Obs.] Shak.

A building material made by mixing lime, cement, or plaster of Paris, with sand, water, and sometimes other materials; -- used in masonry for joining stones, bricks, etc., also for plastering, and in other ways. Mortar bed, a shallow box or receptacle in which mortar is mixed. -- Mortar board. (a) A small square board with a handle beneath, for holding mortar; a hawk. (b) A cap with a broad, projecting, square top; -- worn by students in some colleges. [Slang]

To plaster or make fast with mortar.

A chamber lamp or light. [Obs.] Chaucer.