cat·a·ract (k t  -rkt )n. 1. A large or high waterfall. 2. A great downpour; a deluge. 3. Pathology Opacity of the lens or capsule of the eye, causing impairment of vision or blindness. [Middle English cataracte, from Old French, from Latin cataracta, from Greek katarrakt  s, katarakts, downrush, waterfall, portcullis, probably from katarassein, to dash down (kat-, kata-, cata- + arassein, to strike). Sense 3, from a comparison to a portcullis or other falling impediment or covering.]cat a·ractous (-rkts) adj. |
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