noun a large artillery gun that is usually on wheels.
noun heavy gun fired from a tank.
noun (Middle Ages) a cylindrical piece of armor plate to protect the arm.
noun heavy automatic gun fired from an airplane.
noun lower part of the leg extending from the hock to the fetlock in hoofed mammals.
— synonyms: shank
noun a shot in billiards in which the cue ball contacts one object ball and then the other.
— synonyms: carom
Examples
“In English billiards, a cannon is when one's cue ball strikes the other player's cue ball and the red ball on the same shot; and it is worth two points.”