Waterfall \Wa"ter*fall`\, n.

1. A fall, or perpendicular descent, of the water of a river or stream, or a descent nearly perpendicular; a cascade; a cataract.

2. (Hairdressing) An arrangement of a woman's back hair over a cushion or frame in some resemblance to a waterfall.

Source: Webster's Revised Unabridged Dictionary (1913)