Chae·tog·na·tha, Chæ·tog·na·tha n. pl. 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.
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Chaetognatha
n : arrowworms: a group of small active transparent marine worms
[syn: phylum Chaetognatha]