SINCE 1828
arrow worm
noun
variants:
or less commonly arrowworm \ ˈer-ō-ˌwərm 
, ˈer-ə- , ˈa-rō- , ˈa-rə- \
, ˈer-ə- , ˈa-rō- , ˈa-rə- \
Definition of arrow worm
: any of a phylum (Chaetognatha) of small planktonic wormlike marine organisms having curved bristles on either side of the head for seizing prey
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