trochal

 : 
Adjective
 : 
tro=chal

CIDE DICTIONARY

trochala. [From Gr. a wheel.].
     Resembling a wheel.  [1913 Webster]
Trochal disk (Zoöl.), the cephalic disk of a rotifer. It is usually surrounded by a fringe of cilia.

OXFORD DICTIONARY

trochal, adj. Zool. wheel-shaped.

Idiom
trochal disc Zool. the retractable disc on the head of a rotifer bearing a crown of cilia, used for drawing in food or for propulsion.
Etymology
Gk trokhos wheel

For further exploring for "trochal" in Webster Dictionary Online


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