The Collaborative International Dictionary of English v.0.48:

Ossicle \Os"si*cle\, n. [L. ossiculum, dim. of os, ossis, a
   bone.]
   1. A little bone; as, the auditory ossicles in the tympanum
      of the ear.
      [1913 Webster]

   2. (Zool.) One of numerous small calcareous structures
      forming the skeleton of certain echinoderms, as the
      starfishes.
      [1913 Webster]

WordNet (r) 3.0 (2006):

ossicle
    n 1: a small bone; especially one in the middle ear [syn:
         ossicle, bonelet, ossiculum]