Cataract /(?)/

Cat·a·ract

Cataract

n.
  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. (Surg.)
  3. A kind of hydraulic brake for regulating the action of pumping engines and other machines; -- sometimes called dashpot. (Mach.)