Fromoto- +‎cyst.

otocyst (pluralotocysts)

1. (invertebrate zoology) An organ involved inbalance andorientation.
   • 1898, E. P. Lyon, “The Functions of theOtocyst”, inThe Journal of Comparative Neurology, volume 8:

     If theotocysts were removed from these animals, they swam normally and no peculiarities were observed in their behavior.

2. (vertebrate embryology) The precursor of theinner ear.

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