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.