Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The transparent convex anterior portion of the outer fibrous coat of the eyeball that covers the iris and the pupil and is continuous with the sclera.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The transparent layer making up the outermost front part of the eye, covering the iris, pupil, and anterior chamber.

from the GNU version of the Collaborative International Dictionary of English

  • n. The transparent part of the coat of the eyeball which covers the iris and pupil and admits light to the interior. See eye.

from The Century Dictionary and Cyclopedia

  • n. The firm, transparent anterior portion of the eyeball.
  • n. In entomology, the outer surface of an insect's compound eye.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the transparent dome-shaped anterior portion of the outer covering of the eye; it covers the iris and pupil and is continuous with the sclera

Etymologies

Medieval Latin cornea (tēla), horny (tissue), from Latin corneus, horny, from cornū, horn; see ker-1 in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin cornea tela ("horny tissue"), from cornu ("horn") (Wiktionary)

Examples

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