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Related to arrowworm: acorn worm
(Animals) any small marine invertebrate of the genus Sagitta, having an elongated transparent body with fins and prehensile oral bristles: phylum Chaetognatha (chaetognaths)
any small, translucent marine worm of the phylum Chaetognatha, having lateral and caudal fins.
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|Noun||1.||arrowworm - 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|
worm - any of numerous relatively small elongated soft-bodied animals especially of the phyla Annelida and Chaetognatha and Nematoda and Nemertea and Platyhelminthes; also many insect larvae
sagitta - any arrowworm of the genus Sagitta