Aptera \Ap"te*ra\, n. pl. [NL. aptera, fr. Gr. ? without wings; 'a priv. + ? wing, ? to fly.]

(Zo["o]l.) Insects without wings, constituting the seventh Linn[ae]n order of insects, an artificial group, which included Crustacea, spiders, centipeds, and even worms. These animals are now placed in several distinct classes and orders.

Source: Webster's Revised Unabridged Dictionary (1913)