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arrowworm

[ ar-oh-wurm ]
/ ˈær oʊˌwɜrm /
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noun

any small, translucent marine worm of the phylum (or class) Chaetognatha, having lateral and caudal fins.

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Also called glassworm.

Origin of arrowworm

First recorded in 1885–90; so called from a fancied resemblance to an arrow
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

British Dictionary definitions for arrowworm

arrowworm
/ (ˈærəʊˌwɜːm) /

noun

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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