a mixture of sand, water, and cement or lime that is used to fix bricks or stones to each other when building walls

The truck was carrying not only mortar and cement but huge planks and beams and barrels of nails.

They drilled 361 holes into the base of the tower and filled them with mortar.

a large gun with a short, wide barrel (= a part shaped like a tube) that fires bombs or other explosives very high into the air, or an explosive device shot from such a gun

The truck was packed with heavy weapons, including rocket launchers, mortars, and rockets.

The rebel operations generally consisted of two or three attackers firing mortars from pickup trucks.

The mortar landed in mud and failed to detonate.

a hard, strong bowl in which substances are crushed into a powder by hitting or rubbing them with a pestle (= heavy tool)

Use a pestle and mortar to crush the spices. 用杵和臼将香料碾碎。