_:vb50938530 . _:vb50938530 "An articulation disorder characterized by involuntary sound repetition and disruption or blocking of speech."^^ . _:vb50938530 . _:vb50938530 . _:vb50938530 . _:vb50938530 . _:vb50938530 "url:http://www.merriam-webster.com/dictionary/stutter"^^ . _:vb50938530 "url:http://www.asha.org/public/speech/disorders/stuttering.htm"^^ . _:vb50938530 . _:vb50938530 "url:http://en.wikipedia.org/wiki/Stuttering"^^ .