arrow worm
noun
variants
or less commonly arrowworm
: any of a phylum (Chaetognatha) of small planktonic wormlike marine organisms having curved bristles on either side of the head for seizing prey
Examples of arrow worm in a Sentence
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Fitted with massive, munching jaws on the inside of their mouths, the 13 fossil arrow worms analyzed in the study also feature long, lateral fins — a perfect fit for swimming through the open ocean.
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Sam Walters, Discover Magazine, 9 Jan. 2024
According to the researchers, modern arrow worms are smaller predators that survive on meals of tiny zooplankton.
—Sam Walters, Discover Magazine, 9 Jan. 2024
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Sam Walters, Discover Magazine, 9 Jan. 2024
According to the researchers, modern arrow worms are smaller predators that survive on meals of tiny zooplankton.
—Sam Walters, Discover Magazine, 9 Jan. 2024
Cite this Entry
“Arrow worm.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/arrow%20worm. Accessed 2 Jul. 2025.
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