a large gun mounted on a carriage, used formerly in warfare
an automatic shell-firing gun mounted esp in an aircraft
a heavy tube or drum that rotates freely on its supporting shaft
Brit a shot in billiards in which the cue ball strikes two object balls in succession, or a shot in snooker or pool in which the ball struck by the cue ball strikes a second ball close to it
[French canon via Italian from Latin canna: see cane1; (sense 3) alteration of carom1]