Cornea (noun)

1. The transparent front part of the eye that covers the iris, pupil, and anterior chamber.
2. The outermost layer of the front of the eye that helps to focus light.
3. The clear, curved surface that covers the front of the eye.

Origin:

The word "cornea" comes from the greek word "kornē" which means "horn" or "hard", it refers to the transparent structure of the eye that covers the iris, pupil, and anterior chamber.

Examples:

1. The cornea of the eye is responsible for focusing light.
2. The cornea was damaged in the accident.
3. The cornea can be transplanted to restore vision.
4. The cornea is the first part of the eye that light passes through.
5. The cornea is a clear, curved surface that covers the front of the eye.