Peritricha
noun plural
Pe·rit·ri·cha
| \ pə-ˈri-tri-kə
\
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Medical Definition of Peritricha
: an order of the class Ciliata comprising protozoans with an enlarged disklike ciliated anterior end leading to the cytostome via a counterclockwise zone near the mouth and with reduced body ciliation and often being attached to the substrate by a contractile stalk