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Rotifera (n.)

class of microscopic freshwater organisms, 1830, Modern Latin, from Rotifer (Leeuwenhoek, 1702), from Latin rota "wheel" (see rotary) + -fer "bearing" (from PIE root *bher- (1) "to carry"). The animalcules use rotary organs to swim about.

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Definitions of Rotifera from WordNet

Rotifera (n.)
a phylum including: rotifers;
Synonyms: phylum Rotifera
From wordnet.princeton.edu