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cornea (n.)

"firm, transparent anterior part of the eyeball," late 14c., from Medieval Latin cornea tela "horny web or sheath," from Latin cornu (genitive cornus) "horn" (from PIE root *ker- (1) "horn; head"). So called for its consistency. Related: Corneal.

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Definitions of cornea from WordNet

cornea (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;
From wordnet.princeton.edu