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From The Collaborative International Dictionary of English v.0.48:
Vorticella \Vor`ti*cel"la\, n.; pl. E. Vorticellas, L. Vorticellae. [NL., dim. fr. L. vortex. See Vortex.] (Zool.) Any one of numerous species of ciliated Infusoria belonging to Vorticella and many other genera of the family Vorticellidae. 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. [1913 Webster]