Cornea \Cor"ne*a\ (k?r"n?-?), n.; pl. Corneas (-?z). [Fem. sing., fr. L. corneus horny, fr. cornu a horn. See Horn.]

(Anat.) The transparent part of the coat of the eyeball which covers the iris and pupil and admits light to the interior. See Eye.

Source: Webster's Revised Unabridged Dictionary (1913)