cataract \KAT-uh-rakt\ (noun) - 1 : A large or high waterfall. 2 : A great downpour; a deluge. 3 : Opacity of the lens or capsule of the eye, causing impairment of vision or blindness.
"Determined to press on through the sudden afternoon cataract, Jeff finished the long distance race well ahead of his competitors but had a nasty cold to show for his efforts."
Middle English cataracte, from Old French, from Latin cataracta, from Greek katarraktes, kataraktes, probably from katarassein, to dash down : kat-, kata-, cata- + arassein, to strike.