WordReference Random House Unabridged Dictionary of American English © 2026
trench′ mor′tar, 
  1. a portable, muzzle-loaded mortar, usually having a smooth bore, fired at high angles of elevation to reach concealed enemy targets.
  • 1915–20

Collins Concise English Dictionary © HarperCollins Publishers::
trench mortar n
  1. a portable mortar used in trench warfare to shoot projectiles at a high trajectory over a short range

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