Chaetognatha

from WordNet (r) 3.0 (2006)
Chaetognatha
    n 1: arrowworms: a group of small active transparent marine
         worms [syn: {Chaetognatha}, {phylum Chaetognatha}]
    
from The Collaborative International Dictionary of English v.0.48
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]
    

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