/ Dictionary / Index A armyworm: Meaning and Definition of Find definitions for: ar•my•worm Pronunciation: (är'mē-wûrm"), [key] — n. the caterpillar of a noctuid moth, Pseudaletia unipuncta, that often travels in large numbers over a region, destroying crops of wheat, corn, etc. any of the larvae of several related moths having similar habits. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: armyworm (Thesaurus) Army of the United States arnatto Related Content Daily Word Quiz: weary Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language