a descent of water over a steep surface; a waterfall, esp. one of considerable size.

any furious rush or downpour of water; deluge.

Ophthalmology .

an abnormality of the eye, characterized by opacity of the lens.

the opaque area.

noun

rapids , torrent , flood , delugenotes:a turbulent , rock-obstructed river area is rapid (s) and steep rapids make a cataract , alluvion , cataclysm , deluge , downpour , freshet , inundation , niagara , overflow , cascade , eye disease , fall , falls , lin , waterfall