IPA: /ˈkɔːr.nəl/
KK: /ˈkɔrnəl/
Relating to the transparent front part of the eye that covers the iris and pupil.
The doctor examined the corneal surface for any signs of damage.
Corneal → It is formed from "cornea" (from Latin *cornea*, meaning horn, referring to the transparent front part of the eye) and the suffix "-al" (meaning pertaining to). The word "corneal" means pertaining to the cornea of the eye.
Think of the word 'cornea' which refers to the transparent part of the eye, and remember that 'corneal' means something that pertains to the cornea.