noun
: a plant louse ( Therioaphis trifolii ) that occurs in many parts of the United States and is especially destructive to alfalfa in the southwestern states
noun
: a plant louse ( Therioaphis trifolii ) that occurs in many parts of the United States and is especially destructive to alfalfa in the southwestern states
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012