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Worm, term used for any elongate, cylindrical invertebrate, such as the earthworm, roundworm, hairworm, or acorn worm. The word has no taxonomic validity; animals commonly referred to as worms belong to many related phyla: Chordata, Annelida, and Platyhelminthes. However, the term is sometimes restricted to the phylum Annelida.

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21st Century Webster's Family Encyclopedia21st Century Webster's Family Encyclopedia - Willamette River to Yaoundé