Flap (definition)
From Scottish Gaelic Grammar Wiki
A flap is a sound made using extremely quick contact, usually with the tip of the tongue ''flapping'' against a place of articulation. In English this is generally against the alveolar ridge.The flap is an allophone of [t] and [d] , as in butter or ladder. A flap is transcribed in IPA as [ɾ].
See Also
External Links
http://rhetoric.byu.edu/Figures/E/epenthesis.htm
http://wapedia.mobi/en/Labiodental_flap
http://en.wikipedia.org/wiki/Labiodental_flap
References
Matthews, P. H. The Concise Oxford Dictionary of Linguistics. Oxford: Oxford University Press, 1997.