ar·row·worm /-ˌwɝm/
Ar·row·worm, n. Zool. A peculiar transparent worm of the genus Sagitta, living at the surface of the sea. See Sagitta.
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arrowworm
n : 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 [syn: chaetognath]