arrowworm Meaning, Definition & Usage

  1. noun any worm of the Chaetognatha; transparent marine worm with horizontal lateral and caudal fins and a row of movable curved spines at each side of the mouth
    chaetognath.

WordNet

Ar"row*worm` noun
Definitions
  1. (Zoöl.) A peculiar transparent worm of the genus Sagitta, living at the surface of the sea. See Sagitta.

Webster 1913