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plural ossicles
(anatomy) A small bone (or bony structure), especially one of the three of the middle ear. examples
(zoology) Bone-like joint or plate, especially: quotations
The eyeballs were surrounded by a ring of bones, the sclerotic ossicle, which probably protected their eyes when diving abruptly for prey.
1836, William Buckland, Geology and Mineralogy, Considered with Reference to Natural Theology, volume 1, William Pickering, page 174