ossicle

plural ossicles

1. anatomyA small bone (or bony structure), especially one of the three of the middle ear.

   The incus is one of the three auditory ossicles.

   Synonyms: auditory bone, auditory ossicle, bonelet, ossicular chain, ossicule, ossiculum, otic bone

2. Bone-like joint or plate.
   1. biologyOne of numerous small calcareous structures forming the skeleton of certain echinoderms, as the starfishes.

      The skeleton of echinoderms is made of ossicles, linked to each other via muscles and connective tissue.

   2. biologyOne of the hard articuli or joints of the stem or branches of a crinoid or encrinite.
   3. biologyOne of the several small hard chitinous parts or processes of the gastric skeleton of crustaceans, as in the stomach of a lobster or crawfish.