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mortar

noun

  1. a very hard bowl in which softer substances are ground or pounded to a powder with a pestle
  2. any machine in which materials are ground or pounded
  3. a short-barreled cannon with a low muzzle velocity, which hurls shells in a high trajectory
  4. any of various similar devices, for shooting lifelines, flares, etc.
  5. a mixture of cement or lime with sand and water, used between bricks or stones to bind them together in building, or as plaster

transitive verb

  1. to plaster or bind together with mortar
  2. to attack with mortar shells

See mortar in American Heritage Dictionary 4

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