- A sheath or outer covering, especially around the spinal cord or over the hindwings of certain insects.
Etymology: From Ancient Greek (polytonic, á) "sheath".
- 1997: 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 " Thomas Pynchon, Mason & Dixon
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