The Collaborative International Dictionary
Hemelytrum
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
hemelytrum
n. (alternative form of hemelytron English)