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.
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- peanut butter,
- peanut gallery,
- peanut heaven,
- peanut oil,
- pear haw,
- pear psylla,
- pear thrips
Also called sipunculid.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019