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