翼形水轮

Flutter \Flut"ter\, n.
1. The act of fluttering; quick and irregular motion;
vibration; as, the flutter of a fan.

The chirp and flutter of some single bird --Milnes.
.

2. Hurry; tumult; agitation of the mind; confusion; disorder.
--Pope.

{Flutter wheel}, a water wheel placed below a fall or in a
chute where rapidly moving water strikes the tips of the
floats; -- so called from the spattering, and the
fluttering noise it makes.