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ossiculum

(ŏ-sĭkyə-ləm)
n. pl. os•sic•u•la (-lə)
  1. A small bone; an ossicle.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.