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crown wheel[′krau̇n ‚wēl]
A gear that is light and crown-shaped.
The horizontal escape wheel of a verge escapement timepiece.
The wheel in the winding mechanism of a watch that drives the ratchet wheel and is itself driven by the winding-stem pinion.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.