elytron

Learned borrowing from Ancient Greek ἔλυτρον (élutron, “sheath”).

• IPA^(key): /ˈɛlɪtɹɒn/

elytron (plural elytra)

1. A sheath or outer covering, especially around the spinal cord or over the hindwings of certain insects.
   • 1997, Thomas Pynchon, chapter 9, in Mason & Dixon, 1st US edition, New York: Henry Holt and Company, →ISBN, part One: Latitudes and Departures, page 88:

     In a corner, the Darkling Beetle rustles in its Cage, its Elytra the same unforgiving white as the great sand-waste call’d ‘Kalahari’ lying north of here […]

   • 2020, Aimee Nezhukumatathil, World of Wonders: In Praise of Fireflies, Whale Sharks, and Other Astonishments, Minneapolis: Milkweed Editions, →ISBN, page 9:

     […] the elytra covering the hind wings of the firefly lift like a light leather, suppler than any other beetle’s.