cataract

cataract is a   Noun

Definition:

[1] A great fall of water over a precipice; a large waterfall.

[2] An opacity of the crystalline lens, or of its capsule, which prevents the passage of the rays of light and impairs or destroys the sight.

[3] A kind of hydraulic brake for regulating the action of pumping engines and other machines; -- sometimes called dashpot.

Synonyms: