[Greek θρίξ, τριχ- hair] Zoology of or pertaining to the Hypotricha, an order of the class Ciliata of Protozoa, having the locomotive cilia confined to the ventral surface.
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1885 E. R. Lankester in Encycl. Brit. XIX. 862/2 One of the Hypotricha; lateral view of the animal when using its great hypotrichous processes as ambulatory organs.