Meaning of MORTAR in English

MORTAR

I

Material used in building construction to bond brick, stone, tile, or concrete blocks into a structure.

The ancient Romans are credited with its invention. Mortar consists of sand mixed with cement and water. The resulting substance must be sufficiently flexible to flow slightly but not collapse under the weight of the masonry units. Before the 19th-century invention of portland cement , masons used thin joints of lime mortar, which required greater precision than the thicker joints of portland-cement mortar and were not as strong. For tilework, a very thin mortar called grout is used. Pointing is the process of finishing a masonry joint.

II

Short-range artillery piece with a short barrel and low muzzle velocity that fires an explosive projectile in a high-arched trajectory.

Large mortars were used against fortifications and in siege operations from medieval times through World War I. Since 1915, small portable models have been standard infantry weapons, especially for mountain or trench warfare . Medium mortars, with a caliber of about 3–4 in. (70–90 mm), a range of up to about 2.5 mi (4 km), and a bomb weight of up to 11 lbs (5 kg), are now widely used.

Britannica English dictionary.      Английский словарь Британика.