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arrowworm

[ar-oh-wurm] /ˈær oʊˌwɜrm/
noun
1.
any small, translucent marine worm of the phylum (or class) Chaetognatha, having lateral and caudal fins.
Also called glassworm.
Origin of arrowworm
1885-1890
1885-90; so called from a fancied resemblance to an arrow
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for arrowworm

arrowworm

/ˈærəʊˌwɜːm/
noun
1.
any small marine invertebrate of the genus Sagitta, having an elongated transparent body with fins and prehensile oral bristles: phylum Chaetognatha (chaetognaths)
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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