1. Small, transparent marine worms of the phylum Chaetognatha, characterized by arrow-shaped bodies and bristle-like appendages used for capturing prey.
Usage: plural form; singular is chaetognath; scientific/zoological term; also called arrow worms

Examples

• Chaetognaths are abundant in ocean plankton and serve as important food sources for fish.
• The transparent bodies of chaetognaths make them difficult to spot in seawater.
• Marine biologists study chaetognaths to understand pelagic food webs.
• Chaetognaths use their bristles to grasp small crustaceans and fish larvae.
• These chaetognaths were collected from the deep ocean during the research expedition.