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Mortar or grout is a cement like product that is installed between the joints of the bricks in order to help keep them together.

Merriam-Webster Online Dictionary
mortar (noun)
a sturdy vessel in which material is pounded or rubbed with a pestle
Middle French
a) a muzzle-loading cannon having a tube short in relation to its caliber that is used to throw projectiles at high angles
b) any of several similar firing devices
mortar (noun)
a plastic building material (as a mixture of cement, lime, or gypsum plaster with sand and water) that hardens and is used in masonry or plastering
mortar (verb)
transitive verb
to plaster or make fast with mortar