Etymology

Noun

1. A waterspout
2. A large waterfall; steep rapids in a river.

   The cataracts on the Nile helped compartiment Upper Egypt, since the Pharaonic age marking several nome boundaries

3. A downpour, flood of water
4. A disease of the eye causing its opacity and, unless treated, leading to blindness.
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     Noun

     
     
     
     1. A cataract, waterfall, river rapids
     2. Cataract, a grave, gradual eye lens disease