from
The Collaborative International Dictionary of English v.0.48
Flapper \Flap"per\, n.
1. One who, or that which, flaps.
[1913 Webster]
2. See {Flipper}. "The flapper of a porpoise." --Buckley.
[1913 Webster]
3. A flat object used to make a flapping noise by striking
another object. --RHUD
[PJC]
4. A flat and broad object hanging from a larger object,
either flexible like rubber or hinged to allow a swinging
motion; a flap.
5. A young woman who dresses in a modern, stylish manner and
behaves unconventionally in social situations; -- a term
used especially to refer to young women during the 1920's
and their peculiar style of dress.
[PJC]
{Flapper skate} (Zool.), a European skate ({Raia
intermedia}).
[1913 Webster]