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From The Collaborative International Dictionary of English v.0.48:
outrigger \out"rig`ger\, n. 1. Any spar or projecting timber run out for temporary use, as from a ship's mast, to hold a rope or a sail extended, or from a building, to support hoisting teckle. [1913 Webster] 2. (Naut.) (a) A projecting support for a rowlock, extended from the side of a boat. (b) A boat thus equipped. (c) A projecting contrivance at the side of a boat to prevent upsetting, as projecting spars with a log at the end; also used attributively, as an outrigger canoe. [1913 Webster +PJC] 3. (Aeronautics) A projecting frame used to support the elevator or tail planes, etc. [Webster 1913 Suppl.]