Dictionary![]() ![]() ar•row•wormPronunciation: (ar'ō-wûrm"), [key] —n. any small, translucent marine worm of the phylum (or class) Chaetognatha, having lateral and caudal fins. Also called glassworm. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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