Arcella

Arcella

[ahr-sel-uh]
noun
a genus of freshwater, ameboid protozoa that secrete a hard, umbrellalike shell having a single opening through which the pseudopodia extend.

Origin:
1838; < Neo-Latin, equivalent to Latin arc(a) a chest, box + -ella diminutive suffix

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WordNet
arcella

noun
an amoeba-like protozoan with a chitinous shell resembling an umbrella 
WordNet® 3.0, © 2006 by Princeton University.
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