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whitewater
[ noun ]
frothy water as in rapids or waterfalls
<noun.object>




Rapid \Rap"id\, n. [Cf. F. rapide. See {Rapid}, a.]
The part of a river where the current moves with great
swiftness, but without actual waterfall or cascade; sometimes
called {whitewater}; -- usually used in the plural; as, the
Lachine rapids in the St. Lawrence.
[1913 Webster +PJC]

Row, brothers, row, the stream runs fast,
The rapids are near, and the daylight's past. --Moore.