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Webster's Dictionary (1865)

Pŏl'y-cŷs'tine, n.

noun

n. [Gr. πολύς, many, and κύστις, bladder, cyst.] (Zoöl.) One of a group of animals belonging to the protozoans. See PROTOZOAN.

Three magnified illustrations of polycystines, showing their varied shapes and patterned structures.
Polycystines greatly magnified.