pea nut worm

peanut worm

noun
any small, unsegmented, marine worm of the phylum Sipuncula, that when disturbed retracts its anterior portion into the body, giving the appearance of a peanut seed.
Also called sipunculid.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
peanut worm

noun
small unsegmented marine worm that when disturbed retracts its anterior portion into the body giving the appearance of a peanut 
WordNet® 3.0, © 2006 by Princeton University.
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