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arrowworm

[ ar-oh-wurm ]

noun

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

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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Word History and Origins

Origin of arrowworm1

First recorded in 1885–90; so called from a fancied resemblance to an arrow

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