1 a mixture of cement or lime or both with sand and water, used as a bond between bricks or stones or as a covering on a wall
2 a muzzle-loading cannon having a short barrel and relatively wide bore that fires low-velocity shells in high trajectories over a short range
3 a similar device for firing lifelines, fireworks, etc.
4 a vessel, usually bowl-shaped, in which substances are pulverized with a pestle
5 (Mining) a cast-iron receptacle in which ore is crushed
6 to join (bricks or stones) or cover (a wall) with mortar
7 to fire on with mortars (C13: from Latin mortarium basin in which mortar is mixed; in some senses, via Old French mortier substance mixed inside such a vessel)
n a portable mortar used in trench warfare to shoot projectiles at a high trajectory over a short range
English Collins Dictionary - English Definition & Thesaurus
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"Collins English Dictionary 5th Edition first published in 2000 © HarperCollins Publishers 1979, 1986, 1991, 1994, 1998, 2000 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"