mortar
noun
°A mixture of lime or cement, sand and water used for bonding bricks and stones.
°Military A muzzle-loading, indirect fire weapon with either a rifled or smooth bore. It usually has a shorter range than a howitzer, employs a higher angle of fire, and has a tube with a length of 10 to 20 calibers. See also gun; howitzer. JP-1-02.
verb
°To use mortar or plaster to join two things together.
°To fire a mortar (weapon).