arrow worm

arrowworm

[ar-oh-wurm]
noun
any small, translucent marine worm of the phylum (or class) Chaetognatha, having lateral and caudal fins.
Also called glassworm.


Origin:
1885–90; so called from a fancied resemblance to an arrow

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World English Dictionary
arrowworm (ˈærəʊˌwɜːm)
 
n
any small marine invertebrate of the genus Sagitta, having an elongated transparent body with fins and prehensile oral bristles: phylum Chaetognatha (chaetognaths)

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