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Otolith
Otolith O"to*lith, Otolite O"to*lite, n. [Oto- + -lith,
-lite.] (Anat.)
One of the small bones or particles of calcareous or other
hard substance in the internal ear of vertebrates, and in the
auditory organs of many invertebrates; an ear stone.
Collectively, the otoliths are called ear sand and otoconite.
Meaning of Otoliths from wikipedia