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Any of various worms or wormlike animals of the phylum Annelida, characterized by an elongated, cylindrical, segmented body and including the earthworms and the leeches.
[From New Latin Annelida, phylum name, from French annelés, pl. past participle of anneler, to ring, from Old French anel, ring, from Latin ānellus, diminutive of ānus, ring.]
an·nel′i·dan (ə-nĕl′ĭ-dən) adj.