Etymology
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trebuchet (n.)

"medieval stone-throwing engine of war," c. 1300 (in Anglo-Latin from early 13c.), from Old French trebuchet (12c.) "stone-throwing siege engine," from trabuchier "to overturn, fall to the ground, overthrow" (11c.), from tra- (from Latin trans-, here expressing "displacement") + Old French buc "trunk, bulk," from Frankish *buk- "trunk of the body," from Proto-Germanic *bheu-, variant of *beu-, used in forming words loosely associated with swelling (such as German bauch "belly;" see bull (n.2)).

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Definitions of trebuchet

trebuchet (n.)
an engine that provided medieval artillery used during sieges; a heavy war engine for hurling large stones and other missiles;
Synonyms: catapult / arbalest / arbalist / ballista / bricole / mangonel / onager / trebucket
From wordnet.princeton.edu