mortar - definition and synonyms

noun 

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/ˈmɔː(r)tə(r)/
singularmortar
pluralmortars
  1. 1
    [uncountable] a substance used in building for joining bricks or stones, made by mixing together sand, water, and lime
  2. 3
    [countable] a bowl in which you crush substances into a powder using a tool called a pestle