Definition of arrow worm in English:

arrow worm

Syllabification: ar·row worm

noun

A slender transparent wormlike animal with fins, having spines on the head for grasping prey. It is common in marine plankton. Also called chaetognath (see Chaetognatha).
  • Phylum Chaetognatha
More example sentences
  • Chaetognaths (commonly named arrow worms) are transparent marine metazoans, ranging in size from 2 to 120 mm.
  • As mentioned, the chaetognaths (‘arrow worms’) are clearly orthodox bilaterians.
  • Early Cambrian ‘protoconodonts’ are currently believed to be the unrelated remains of chaetognaths (or ‘arrow worms’).

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