Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Any of various protozoans, such as the vorticella, having a wide oral opening surrounded by cilia.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A ciliate protozoan of the subclass Peritrichia.

Etymologies

From New Latin Peritrichida, former order name : peri- + Greek thrix, trikh-, hair.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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