noun
: one of the external filaments or leaflike plates connected with the tracheae of the inside of the body that form part of the respiratory system of some aquatic insect larvae and nymphs but rarely persist in the adult
noun
: one of the external filaments or leaflike plates connected with the tracheae of the inside of the body that form part of the respiratory system of some aquatic insect larvae and nymphs but rarely persist in the adult
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012