spīˈrä.trə̇kə noun plural
Usage: capitalized
Etymology: New Latin, from spir- + -tricha
: a large order consisting of euciliate protozoans with well-developed peristome and adoral zone of membranelles and general body cilia that are uniform or variously reduced and fused into cirri and including the suborders Heterotricha, Oligotricha, and Hypotricha