[kee-tog-nath, -tuhg-]
any animal of the phylum Chaetognatha, comprising the arrowworms.
Also, chaetognathan [kee-tog-nuh-thuhn] , chaetognathous. belonging or pertaining to the Chaetognatha.

1885–90; < Neo-Latin Chaetognatha, neuter plural of chaetognathus; see chaeto-, -gnathous Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
chaetognath (ˈkiːtɒɡˌnæθ)
any small wormlike marine invertebrate of the phylum Chaetognatha, including the arrowworms, having a coelom and a ring of bristles around the mouth
[C19: New Latin Chaetognatha, literally: hair-jaw, from chaeta + Greek gnathos jaw]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
chaetognath   (kē'tŏg-nāth')  Pronunciation Key 
Any of various small, wormlike marine invertebrates of the phylum Chaetognatha, having often transparent or translucent bodies that are pointed at one end. The head has small hooks for grasping prey, and it contains a large cerebral ganglion of sensory nerves. Chaetognaths are popularly called arrowworms, and are thought to be related to the echinoderms and chordates.
The American Heritage® Science Dictionary
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