'Flipper' definitions:

Definition of 'flipper'

From: WordNet
noun
A shoe for swimming; the paddle-like front is an aid in swimming (especially underwater) [syn: flipper, fin]
noun
The flat broad limb of aquatic animals specialized for swimming

Definition of 'Flipper'

From: GCIDE
  • Flipper \Flip"per\, n. [Cf. Flip, Flippant.]
  • 1. (Zool.) A broad flat limb used for swimming, as those of seals, sea turtles, whales, etc. [1913 Webster]
  • 2. (Naut.) The hand. [Slang] [1913 Webster]

Definition of 'flipper'

From: GCIDE
  • flippers \flippers\ n. flipper [By analogy with flipper[W13(1)], the limb of an aquatic animal used for locomotion] A type of shoe with a paddle-like front extending well beyond the end of the toe, used an aid in swimming (especially underwater).
  • Note: They are typically of rubber-like material, and are not worn when walking on land.
  • Syn: fin, fins. [WordNet 1.5]