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arrow worm

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arrow worm  
n.  Any of various small slender marine worms of the phylum Chaetognatha having a narrow, almost transparent body and sickle-shaped bristles on each side of the mouth.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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