ossicle

A small bone, especially one of the three bones of the middle ear.

A small bone or bonelet.

A small hard nodule of chitin or some substance resembling bone.

Also ossicule, ossiculum.

A little bone.

One of numerous small calcareous structures forming the skeleton of certain echinoderms, as the starfishes.

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

Bone-like joint or plate, especially:

a small bone; especially one in the middle ear