1. A strong vessel, commonly in form of an inverted bell, in which substances are pounded or rubbed with a pestle. 2. Etym: [F. mortier, fr. L. mortarium mortar (for trituarating).] (Mil.) A short piece of ordnance, used for throwing bombs, carcasses, shells, etc., at high angles of elevation, as 45º, and even higher; - - so named from its resem...