adj. Hard; firm; indurated; -- applied especially in anatomy to the firm outer coat of the eyeball, which is often cartilaginous and sometimes bony.adj. Of or pertaining to the sclerotic coat of the eye; sclerotical.adj. Affected with sclerosis; sclerosed.n. The sclerotic coat of the eye. See Illust. of eye (d).adj. Pertaining to, or designating, an acid obtained from ergot or the sclerotium of a fungus growing on rye.