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sea mouse

noun
1.
any of several large, marine annelids of the genus Aphrodite and related genera, having a covering of long, fine, hairlike setae.
Origin
1510-1520
1510-20
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for sea mice

sea mouse

noun
1.
any of several large polychaete worms of the genus Aphrodite and related genera, having a broad flattened body covered dorsally with a dense mat of iridescent hairlike chaetae
Word Origin
C16: so called because of its appearance
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
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Encyclopedia Article for sea mice

sea mouse

(Aphrodita), any of a genus of marine worms of the class Polychaeta (phylum Annelida), named for their mouselike appearance and behaviour.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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