• Webster's Revised Unabridged Dictionary
    • n. pl Hypotricha (Zoöl) A division of ciliated Infusoria in which the cilia cover only the under side of the body.
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Century Dictionary and Cyclopedia
    • hypotricha An order of ciliate infusorians. These animalcules are free-swimming, and are mostly flattened or compressed; the locomotive cilia are confined to the inferior or ventral surface, and often variously modified; the superior or dorsal surface is usually smooth or glabrous, but occasionally bears a few scattered or longitudinal rows of immotile setose cilia; the oral and anal apertures are conspicuously developed, and ventrally located; and trichocysts are rarely developed. The order was founded by Stein, and is contrasted with Heterotricha, Holotricha, and Peritricha. It contains about 6 families and 40 genera.
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Webster's Revised Unabridged Dictionary
NL., fr. Gr. "ypo` beneath + , , a hair