The Collaborative International Dictionary of English v.0.48:

Orthopteran \Or*thop"ter*an\, n. (Zool.)
   One of the Orthoptera.
   [1913 Webster]

WordNet (r) 3.0 (2006):

orthopteran
    n 1: any of various insects having leathery forewings and
         membranous hind wings and chewing mouthparts [syn:
         orthopterous insect, orthopteron, orthopteran]