Chaetognatha n 1: arrowworms: a group of small active transparent marine worms [syn: {Chaetognatha}, {phylum Chaetognatha}]
Chaetognatha \Chae*tog"na*tha\, Chaetognatha \Ch[ae]*tog"na*tha\, n. pl. [NL., from Gr. ? hair + ? jaw.] (Zool) a phylum consisting of the arrowworms, a group of small active transparent free-swimming marine worms, of which the genus {Sagitta} is the type. They have groups of curved spines on each side of the head. Syn: phylum Chaetognatha. [1913 Webster + WordNet 1.5]