sclerotal

from The Century Dictionary.

• Having the character of, or pertaining to, a sclerotal: distinguished from sclerotic.
• Same as sclerotic.
• noun In zoology, a bone of the eyeball; one of a number of scleroskeletal ossifications developed in the sclerotic coat of the eye, usually consisting of a ring of small flat squarish bones encircling the cornea, having slight motion upon one another, but collectively stiffening the coat of the eye and preserving the peculiar shape which it has, as in an owl, for instance. In birds the sclerotals are usually from twelve to twenty in number.
• noun Same as sclerotica.

from the GNU version of the Collaborative International Dictionary of English.

• adjective (Anat.) Sclerotic.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective anatomy sclerotic
• noun anatomy The optic capsule; the sclerotic coat of the eye.