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lithocyst

noun
lith·​o·​cyst | \"+ˌ-\

Definition of lithocyst 

1 : a sac containing lithites that is found in many medusae and other invertebrates and is held to be an auditory organ

2 : a cell that includes a cystolith

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History and Etymology for lithocyst

International Scientific Vocabulary lith- + cyst

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