Noun
A little bone; as, the auditory ossicles in the tympanum of the ear.
One of numerous small calcareous structures forming the skeleton of certain echinoderms, as the starfishes.
Source: Webster's dictionaryIn many amphibians, there is also a second auditory ossicle, the operculum (not to be confused with the structure of the same name in fishes). Source: Internet
Chronic ear infection (a fairly common diagnosis) can cause a defective ear drum or middle-ear ossicle damages, or both. Source: Internet