Definitions from Wiktionary ( )

▸ noun:  (uncountable) A mixture of lime or cement, sand and water used for bonding building blocks.
▸ noun:  (countable) A hollow vessel used to pound, crush, rub, grind or mix ingredients with a pestle.
▸ noun:  (countable, military, historical) A short, heavy, large-bore cannon designed for indirect fire at very steep trajectories.
▸ noun:  (countable, military) A relatively lightweight, often portable indirect fire weapon which transmits recoil to a base plate and is designed to lob explosive shells at very steep trajectories.
▸ noun:  (countable) In paper milling, a trough in which material is hammered.
▸ verb:  (transitive) To use mortar or plaster to join two things together.
▸ verb:  (transitive) To pound in a mortar.
▸ verb:  To fire a mortar (weapon).
▸ verb:  To attack (someone or something) using a mortar (weapon).

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