1 (plural usually same) a large, heavy piece of artillery, typically mounted on wheels, formerly used in warfare:they would cross at the Town ford, under cover of the defending cannon
a heavy automatic gun that fires shells from an aircraft or tank:the gunships blasted arms depots with 105 mm cannon fire and rockets
2 Billiards & Snooker, chiefly British a stroke in which the cue ball strikes two balls successively.
