arrow worm

noun

variants or less commonly arrowworm

ˈer-ō-ˌwərm 

ˈer-ə-,

ˈa-rō-,

ˈa-rə-

: any of a phylum (Chaetognatha) of small planktonic wormlike marine organisms having curved bristles on either side of the head for seizing prey

Word History

First Known Use

1859, in the meaning defined above

Kids Definition

arrow worm

noun

: any of various small ocean animals that look like worms