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From The Collaborative International Dictionary of English v.0.48:
Gunner \Gun"ner\, n. 1. One who works a gun or cannon, whether on land, sea, or in the air; a cannoneer. [1913 Webster] 2. A warrant officer in the navy having charge of the ordnance on a vessel. [1913 Webster] 3. (Zool.) (a) The great northern diver or loon. See Loon. (b) The sea bream. [Prov. Eng. or Irish] [1913 Webster] Gunner's daughter, the gun to which men or boys were lashed for punishment. [Sailor's slang] --W. C. Russell. tail gunner (Mil.) A member of the crew of a bomber airplane who operates the defensive gun at the rear of the airplane. [1913 Webster +PJC]