tentaculocyst

noun
ten·tac·u·lo·cyst

Definition of tentaculocyst 

: one of the sense organs situated on the margin of the umbrella of many jellyfishes, consisting of a greatly modified and reduced tentacle containing a cavity with lithites, and often being sunk in a pit or enclosed in a pouch

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History and Etymology for tentaculocyst

New Latin tentaculum + -o- + English cyst

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