trim tab

trim tab or trimming tab noun Aeronautics. an independently controlled tab set in the trailing edge of a control surface, as an elevator, aileron, or rudder, to hold it in a position suitable for stabilizing the aircraft in a flight attitude. Liberaldictionary.com

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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019 British Dictionary definitions for trim tab trim tab noun a small control surface attached to the trailing edge of a main control surface to enable the pilot to trim an aircraft Collins English Dictionary – Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012