Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
armyworm is a noun meaning "noctuid moth larvae that travel in multitudes destroying especially grass and grain". It carries 3 recorded senses.
noctuid moth larvae that travel in multitudes destroying especially grass and grain
moth whose destructive larvae travel in multitudes
larva of fungus gnat that feed on cereals and other grains; they march in large companies in regular order when the food is exhausted
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for armyworm come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.