mortar

1. (uncountable) A mixture of lime or cement, sand and water used for bonding building blocks.Examples: "The holy hearth! If any earthly and material thing, or rather a divine idea embodied in brick and mortar, might be supposed to possess the permanence of moral truth, it was this."uncountable

2. (countable) A hollow vessel used to pound, crush, rub, grind or mix ingredients with a pestle.Synonyms: mortar and pestle, pestle and mortarcountable

3. (countable, military, historical) A short, heavy, large-bore cannon designed for indirect fire at very steep trajectories.countablehistorical

4. (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.countable

5. (countable) In paper milling, a trough in which material is hammered.countable