Aptera

n. pl. [N. Lat. aptera, Gr. ἄπτερος, without wings, from a priv. and πτερόν, wing, from πέτεσθαι, to fly.] (Entom.) Insects without wings, constituting the seventh order of insects in Linnæus’s system; and including also crustacea, spiders, centipeds, and even worms. But later zoologists have made a different distribution of these animals, some restricting the name to the tribe of insects which includes the flea. Dana.