From The Collaborative International Dictionary of English v.0.48 [gcide]:
Lithocyst \Lith"o*cyst\ (l[i^]th"[-o]*s[i^]st), noun [Litho- + cyst.] (Zool.) A sac containing small, calcareous concretions (otoliths). They are found in many Medus[ae], and other invertebrates, and are supposed to be auditory organs.
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