The Collaborative International Dictionary
Hemelytron
Hemelytron \Hem*el"y*tron\ (? or ?), Hemelytrum \Hem*el"y*trum\ (-tr[u^]m cf. Elytron, 277),, n.; pl. Hemelytra. [NL. See Hemi, and Elytron.] (Zo["o]l.) One of the partially thickened anterior wings of certain insects, as of many Hemiptera, the earwigs, etc.
Wiktionary
hemelytron
n. (context anatomy English) An insect's forewing with both membranous and hardened portions.