"Lisp"@en . "307.9" . "F80.8" . "A lisp, also known as sigmatism, is a speech impediment in which a person misarticulates sibilants ([s], [z], [ts], [dz]), ([\u0292], [\u0283], [t\u0283], [d\u0292]). These misarticulations often result in unclear speech."@en .