Source : Webster's Revised Unabridged Dictionary (1913)

Hypotricha \Hy*pot"ri*cha\, n. pl. [NL., fr. Gr. "ypo` beneath +
   ?, ?, a hair.] (Zo["o]l.)
   A division of ciliated Infusoria in which the cilia cover
   only the under side of the body.