noun, plural vorticellae [vawr-tuh-sel-ee] , vorticellas.
any ciliated protozoan of the genus Vorticella, having a transparent, bell-shaped body with a retractile stalk.

1780–90; < Neo-Latin; see vortex, -ella

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World English Dictionary
vorticella (ˌvɔːtɪˈsɛlə)
n , pl -lae
any protozoan of the genus Vorticella, consisting of a goblet-shaped ciliated cell attached to the substratum by a long contractile stalk
[C18: from New Latin, literally: a little eddy, from vortex]

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