[ar.my.worm] n (1816): any of numerous moths whose larvae travel in multitudes from field to field destroying grass, grain, and other crops; esp: the common armyworm (Pseudaletia unipuncta) of the northern U.S.
ARMYWORM
Meaning of ARMYWORM in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012