The Collaborative International Dictionary of English v.0.48:
Flutter \Flut"ter\, n.
1. The act of fluttering; quick and irregular motion;
vibration; as, the flutter of a fan.
[1913 Webster]
The chirp and flutter of some single bird --Milnes.
.
[1913 Webster]
2. Hurry; tumult; agitation of the mind; confusion; disorder.
--Pope.
[1913 Webster]
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.
[1913 Webster]