*orgyia*

‖prop. n. [ NL., fr. Gr. &unr_; the length of the outstretched arms. So named because, when at rest, it stretches forward its fore legs like arms. ] (Zool.). A genus of bombycid moths whose caterpillars (esp. those of Orgyia leucostigma) are often very injurious to fruit trees and shade trees. The female is wingless. Called also vaporer moth. [ 1913 Webster ]