(definition) by Webster 1913 Wed Dec 22 1999 at 1:55:22

Pe*rit"ri*cha (?), n. pl. [NL., fr. Gr. about + , , hair.] Zool.

A division of ciliated Infusoria having a circle of cilia around the oral disk and sometimes another around the body. It includes the vorticellas. See Vorticella.

 

© Webster 1913.

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