| Noun | 1. | order Siphonaptera - fleas animal order - the order of animals class Hexapoda, class Insecta, Hexapoda, Insecta - insects; about five-sixths of all known animal species flea - any wingless bloodsucking parasitic insect noted for ability to leap family Pulicidae, Pulicidae - many common fleas attacking humans and domestic animals genus Tunga, Tunga - a genus of Siphonaptera Echidnophaga, genus Echidnophaga - a genus of Siphonaptera |