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The Collaborative International Dictionary
Cysticule

Cysticule \Cys"ti*cule\ (s?s"t?-k?l), n. [Dim. of cyst.] (Anat.) An appendage of the vestibular ear sac of fishes.
--Owen.

Wiktionary
cysticule

n. (context anatomy English) An appendage of the vestibular ear sac of fishes.