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From The Collaborative International Dictionary of English v.0.48:
Orthoptera \Or*thop"te*ra\, prop. n. pl. [NL., fr. Gr. 'orqo`s straight + ? feather, wing.] (Zool.) An order of mandibulate insects including grasshoppers, locusts, cockroaches, mantids, crickets, katydids, etc. See Illust. under Insect. [1913 Webster] Note: The anterior wings are usually thickened and protect the membranous posterior wings, which are larger and fold longitudinally like a fan. They also have chewing mouth parts. The Orthoptera undergo no metamorphosis. [1913 Webster +PJC]