ossicle
/ˈɒsɪkl/noun
1- Anatomy & Zoology a very small bone, especially one of those in the middle ear【剖, 动】小骨（尤指听小骨）。
1.1
- Zoology a small piece of calcified material forming part of the skeleton of an invertebrate animal such as an echinoderm【动】小骨片。
词源
late 16th cent.: from Latin ossiculum, diminutive of os 'bone'.