ˈhaʊ.ɪts.ə(ɹ) ˈhaʊ.ɪts.əɹ ˈmɔːtə(ɹ) ˈmɔːtə(ɹ) plaster with mortar mortar the wall a muzzle-loading high-angle gun with a short barrel that fires shells at high elevations for a short range a bowl-shaped vessel in which substances can be ground and mixed with a pestle used as a bond in masonry or for covering a wall