资料来源 : Webster's Revised Unabridged Dictionary (1913)

Chaetognatha \Ch[ae]*tog"na*tha\, n. pl. [NL., from Gr. ? hair +
   ? jaw.] (Zo["o]l)
   An order of free-swimming marine worms, of which the genus
   {Sagitta} is the type. They have groups of curved spines on
   each side of the head.

资料来源 : WordNet®

Chaetognatha
     n : arrowworms: a group of small active transparent marine worms
         [syn: {phylum Chaetognatha}]