/ Dictionary / Index A arrowworm: Meaning and Definition of Find definitions for: ar•row•worm Pronunciation: (ar'ō-wûrm"), [key] — n. any small, translucent marine worm of the phylum (or class) Chaetognatha, having lateral and caudal fins. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: arrowworm (Thesaurus) arrowwood arrowy Related Content Daily Word Quiz: tactful Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language