cataract Meaning, Definition & Usage

  1. noun an eye disease that involves the clouding or opacification of the natural lens of the eye
  2. noun a large waterfall; violent rush of water over a precipice

WordNet

Cat"a*ract noun
Etymology
L. cataracta, catarracles, a waterfall, Gr. , , fr. to break down; in the passive, to fall or rush down (of tumors) to burst; down + to break.
Definitions
  1. A great fall of water over a precipice; a large waterfall.
  2. (Surg.) 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. (Mach.) A kind of hydraulic brake for regulating the action of pumping engines and other machines; -- sometimes called dashpot.

Webster 1913