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Mortar has several meanings:
  • Mortar (masonry)
    Mortar (masonry)
    Mortar is a workable paste used to bind construction blocks together and fill the gaps between them. The blocks may be stone, brick, cinder blocks, etc. Mortar becomes hard when it sets, resulting in a rigid aggregate structure. Modern mortars are typically made from a mixture of sand, a binder...

    , material used in masonry to fill the gaps between blocks and bind them together.
  • Mortar (weapon)
    Mortar (weapon)
    A mortar is an indirect fire weapon that fires explosive projectiles known as bombs at low velocities, short ranges, and high-arcing ballistic trajectories. It is typically muzzle-loading and has a barrel length less than 15 times its caliber....

     fires shells at a much lower velocity and higher ballistic arc than other ordnance.
  • Mortar (firestop)
    Mortar (firestop)
    Firestop mortars are mortars most typically used to firestop large openings in walls and floors required to have a fire-resistance rating. They are passive fire protection items...

    , hydraulic cementitious material used to firestop
    A firestop is a passive fire protection system of various components used to seal openings and joints in fire-resistance rated wall and/or floor assemblies, based on fire testing and certification listings....

     through-penetrations in wall and floor assemblies required to have a fire-resistance rating
    Fire-resistance rating
    A fire-resistance rating typically means the duration for which a passive fire protection system can withstand a standard fire resistance test. This can be quantified simply as a measure of time, or it may entail a host of other criteria, involving other evidence of functionality or fitness for...

  • Mortar methods
    Mortar methods
    Mortar methods are discretization methods for partial differential equations, which use separate finite element discretization on nonoverlapping subdomains. The meshes on the subdomains do not match on the interface, and the equality of the solution is enforced by Lagrange multipliers, judiciously...

    , discretization methods for partial differential equations.
  • Mortar and pestle
    Mortar and pestle
    A mortar and pestle is a tool used to crush, grind, and mix solid substances . The pestle is a heavy bat-shaped object, the end of which is used for crushing and grinding. The mortar is a bowl, typically made of hard wood, ceramic or stone...

    , a vessel and implement used to crush or grind materials.
  • Mortarboard, a flattened type of headwear normally worn as part of academic dress
    Academic dress
    Academic dress or academical dress is a traditional form of clothing for academic settings, primarily tertiary education, worn mainly by those that have been admitted to a university degree or hold a status that entitles them to assume them...