vorticella
noun
vor·ti·cel·la
ˌvȯr-tə-ˈse-lə
plural vorticellae
ˌvȯr-tə-ˈse-(ˌ)lē
or vorticellas
: any of a genus (Vorticella) of stalked bell-shaped ciliates
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Merriam-Webster unabridged
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