Etymology
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cannon (n.)

c. 1400, "artillery piece, mounted gun for throwing projectiles by force of gunpowder," from Anglo-French canon (mid-14c.), Old French canon (14c.), from Italian cannone "large tube, barrel," augmentative of Latin canna "reed, tube" (see cane (n.)). The double -n- spelling to differentiate it from canon is from c. 1800. Cannon fodder (1847) translates German kanonenfutter (compare Shakespeare's food for powder in "I Hen. IV").

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Definitions of cannon
1
cannon (n.)
a large artillery gun that is usually on wheels;
cannon (n.)
heavy gun fired from a tank;
cannon (n.)
(Middle Ages) a cylindrical piece of armor plate to protect the arm;
cannon (n.)
heavy automatic gun fired from an airplane;
cannon (n.)
lower part of the leg extending from the hock to the fetlock in hoofed mammals;
Synonyms: shank
cannon (n.)
a shot in billiards in which the cue ball contacts one object ball and then the other;
Synonyms: carom
2
cannon (v.)
make a cannon;
cannon (v.)
fire a cannon;
From wordnet.princeton.edu