arrow worm

noun
\-ˌwərm \
variants: or less commonly arrowworm

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

First Known Use of arrow worm

1859, in the meaning defined above

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The first known use of arrow worm was in 1859

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