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From The Collaborative International Dictionary of English v.0.48:
Otocyst \O"to*cyst\, n. [Oto- + cyst.] (Zool. & Anat.) An auditory cyst or vesicle; one of the simple auditory organs of many invertebrates, containing a fluid and otoliths; also, the embryonic vesicle from which the parts of the internal ear of vertebrates are developed. [1913 Webster]