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Pronunciation: o'to-sist


  1. Embryonic otic vesicle.
  2. A balancing organ, analogous to the utricle of mammals, possessed by certain invertebrates and containing grains of calcareous material or of sand.

[oto- + G. kystis, a bladder]

Further information

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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review date: Sep 19, 2016.