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1. Chiefly poetic a bird's wing
2. the part of a bird's wing including the flight feathers
a cogwheel that engages with a larger wheel or rack, which it drives or by which it is driven
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
The smaller of a pair of gear wheels or the smallest wheel of a gear train.
The distal portion of a bird's wing.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.