mortar
n. uncountablen. a thick mixture of sand, water, and cement used to hold bricks or stones together in a wall. It acts like a strong glue that hardens as it dries.
n. a workable paste used to bind building blocks such as stones, bricks, and concrete masonry units together. It hardens over time to create a structural bond between the materials.
The builder applied fresh mortar between the red bricks.
The old stone wall began to crumble because the mortar had washed away after years of heavy rain.
Restoration experts must carefully match the chemical composition of the original lime mortar to ensure the structural integrity and historical accuracy of the cathedral's facade.
From Middle English morter, from Old French mortier, from Latin mortārium. Doublet of mortarium.