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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.
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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)
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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