ossicle
Concise Oxford English Dictionary © 2008 Oxford University Press:
ossicle /ˈɒsɪk(ə)l/
▶noun
- 1 Anatomy & Zoology a very small bone, especially one of those in the middle ear.
- 2 Zoology a small piece of calcified material forming part of the skeleton of an invertebrate animal such as an echinoderm.
– origin C16: from L. ossiculum, dimin. of os ‘bone’.
'ossicle' also found in these Oxford entries:

