Mortar

Mortar has several meanings:

• Mortar (weapon), an indirect-fire artillery piece that fires shells at a much-lower velocity and higher ballistic arc than other artillery
• Mortar (firestop), a hydraulic cementitious material used to firestop through-penetrations in wall and floor assemblies required to have a fire-resistance rating
• Mortar (masonry), a material used in masonry to fill the gaps between blocks and bind them together
• Mortar and pestle, a vessel and implement used to crush or grind materials
• Mortar methods, discretization methods for partial differential equations
• Mortarboard, a flattened type of headwear normally worn as part of academic dress