Webster's Revised Unabridged Dictionary · 1913

Aptera

Aptera ({not transcribed}) , noun, plural

[New Latin aptera, from Greek {not transcribed} without wings; 'a priv. + {not transcribed} wing, {not transcribed} to fly.]

(Zoology) Insects without wings, constituting the seventh Linnan 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.