Vor′ti‐cel″la (?), n.; pl. E. Vorticellas (�), L. Vorticellæ (�). [NL., dim. fr. L. vortex. See Vortex.] (Zoöl.) Any one of numerous species of ciliated Infusoria belonging to Vorticella and many other genera of the family Vorticellidæ. They have a more or less bell-shaped body with a circle of vibrating cilia around the oral disk. Most of the species have slender, contractile stems, either simple or branched.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.