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cheilectomy

n.
  1. Excision of a portion of the lip.
  2. The chiseling away of bony irregularities on the lips of a joint cavity that interfere with movements of the joint.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.