retainer(redirected from extracoronal retainer)
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1. History a supporter or dependant of a person of rank, esp a soldier
2. a clip, frame, or similar device that prevents a part of a machine, engine, etc., from moving
3. a dental appliance for holding a loose tooth or prosthetic device in position
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
A device that holds a mechanical component in place.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.