<p><strong>Noun</strong></p><ul><li>Phonetics.</li><li>The systematic articulation of s and z in a forward, dental position, like th-sounds, as a manifestation of a speech disorder or a stylistic affectation.</li><li>Any unconventional articulation of the sibilants, as the pronunciation of s and z with the tongue between the teeth (lingual protrusion lisp), close to or touching the upper front teeth (dental lisp), or raised so that the breath is emitted laterally (lateral lisp).</li><li>The act, habit, or sound of lisping.</li></ul><p><strong>Verb</strong></p><ul><li>(used with or without object) to pronounce or speak with a lisp.</li><li>To speak imperfectly, especially in a childish manner.</li></ul>