cornea

Từ điển WordNet v3.1 - WordNet Dictionary

noun

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
• Derivationally related forms:
corneal
• Hypernyms:
membrane, tissue layer
• Hyponyms:
arcus, arcus senilis
• Part Holonyms:
eye, oculus, optic