Noun | 1. | ![]() animal order - the order of animals class Hexapoda, class Insecta, Hexapoda, Insecta - insects; about five-sixths of all known animal species orthopteran, orthopteron, orthopterous insect - any of various insects having leathery forewings and membranous hind wings and chewing mouthparts Acrididae, family Acrididae, family Locustidae, Locustidae - short-horned grasshoppers; true locusts family Tettigoniidae, Tettigoniidae - long-horned grasshoppers; katydids family Stenopelmatidae, Stenopelmatidae - long-horned grasshoppers family Gryllidae, Gryllidae - crickets |