Source : Webster's Revised Unabridged Dictionary (1913)

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.