Cataract

1. n. A kind of hydraulic brake for regulating the action of pumping engines and other machines; — sometimes called dashpot.
2. n. A great fall of water over a precipice; a large waterfall.
3. n. 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.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.