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The Collaborative International Dictionary
Trochal

Trochal \Tro"chal\, a. [From Gr. ? a wheel.] (Zo["o]l.) Resembling a wheel.

Trochal disk (Zo["o]l.), the cephalic disk of a rotifer. It is usually surrounded by a fringe of cilia.

Wiktionary
trochal

a. (context zoology English) Resembling a wheel.