Any white lesion of the eye, esp. a corneal opacity or a cataract. In later use English regional (northern), Scottish, and Irish English (northern).

The defluxion or extravasation of a fluid or ‘humour’ over a part of the body; †concrete the fluid itself; spec. in Old Medicine, cataract.

Pathology. An opacity of the crystalline lens of the eye, or of the capsule of the lens, or of both, ‘producing more or less impairment of sight…

A web or cataract in the eye.

(a) a cataract or other opacity in the eye; = pearl, n.1 1b; (b) a facet in a compound eye.

a cataract or other opacity of the eye (= web, n. 12a); (also) a membrane supposedly covering the eye (of a mole).

Pathology. Cataract in the eye. Obsolete.

(a) (an eye affected by) a kind of cataract (cf. sense A. 1b) (now rare); (b) an eye (of a bird or animal) that resembles a pearl in appearance.

cataract.

cataract formation affecting the nucleus (central core) of the lens; an instance of this.