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ribbon worm

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noun
  1. any of various slender, unsegmented marine worms of the phylum Nemertea, being able to contract and stretch to an extreme extent.

Origin of ribbon worm

First recorded in 1850–55
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for ribbon worm

ribbon worm

noun
  1. another name for nemertean (def. 1)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012