"Sclerotic" is a word in ENGLISH

Affected with sclerosis; sclerosed.

The sclerotic coat of the eye. See Illust. of Eye (d).

Pertaining to, or designating, an acid obtained from
ergot or the sclerotium of a fungus growing on rye.

Of or pertaining to the sclerotic coat of the eye;
sclerotical.

Hard; firm; indurated; -- applied especially in anatomy
to the firm outer coat of the eyeball, which is often cartilaginous and
sometimes bony.