pəˈri.trə̇kə noun plural
Usage: capitalized
Etymology: New Latin, from peri- + -tricha (from Greek trich-, thrix hair) — more at trichina
: an order of Ciliophora comprising euciliate protozoans with an enlarged disklike ciliated anterior end leading to the cytostome via a counterclockwise adoral zone and with reduced body ciliation and often being attached to the substrate by a contractile stalk