Ĕl'y-trŏn or Ĕl'y-trŭm, n.

(Synop., § 130), n.; pl. ĔL'Y-TRA. [N. Lat. elytrum, Gr. ἔλυτρον, a covering, the sheath of a beetle’s wing, from ἐλύειν, to roll round.] (Entom.) One of the wing-sheaths which form the outer wings or covering in the tribe of beetles.