lisp

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A speech defect or mannerism characterized by mispronunciation of the sounds (s) and (z) as (th) and (th).
2. n. A sound of or like a lisp: "The carpenter['s] . . . plane whistles its wild ascending lisp” ( Walt Whitman).
3. v. To speak with a lisp.
4. v. To speak imperfectly, as a child does.
5. v. To pronounce with a lisp.

Century Dictionary and Cyclopedia

1. To pronounce the sibilant letters s and z imperfectly, as by giving the sound of th (as in thin) or Ŧh (as in this, either.)
2. To speak imperfectly, as in childhood; make feeble, imperfect, or tentative efforts at speaking; hence, to speak in a hesitating, modest way.
3. To pronounce with a lisp or imperfectly.
4. n. The habit or act of lisping, as in uttering th for s, and Ŧh for z; an indistinct utterance, as of a child.

Wiktionary

1. n. The habit or an act of lisping.
2. v. To pronounce the sibilant letter ‘s’ imperfectly; to give ‘s’ and ‘z’ the sounds of ‘th’ (IPA: /θ / ð/) — a defect common amongst children.
3. v. To speak with imperfect articulation; to mispronounce, as a child learning to talk.
4. v. To speak hesitatingly and with a low voice, as if afraid.
5. v. To pronounce with a lisp.
6. v. To utter with imperfect articulation; to express with words pronounced imperfectly or indistinctly, as a child speaks; hence, to express by the use of simple, childlike language.
7. v. To speak with reserve or concealment; to utter timidly or confidentially; as, to lisp treason.

GNU Webster's 1913

1. v. To pronounce the sibilant letter s imperfectly; to give s and z the sound of th; -- a defect common among children.
2. v. To speak with imperfect articulation; to mispronounce, as a child learning to talk.
3. v. To speak hesitatingly with a low voice, as if afraid.
4. v. To pronounce with a lisp.
5. v. To utter with imperfect articulation; to express with words pronounced imperfectly or indistinctly, as a child speaks; hence, to express by the use of simple, childlike language.
6. v. To speak with reserve or concealment; to utter timidly or confidentially.
7. n. The habit or act of lisping. See lisp, v. i., 1.
8. n. (Computers) a high-level computer programming language in which statements and data are in the form of lists, enclosed in parentheses; -- used especially for rapid development of prototype programs in artificial intelligence applications .

WordNet 3.0

1. n. a flexible procedure-oriented programing language that manipulates symbols in the form of lists
2. n. a speech defect that involves pronouncing `s' like voiceless `th' and `z' like voiced `th'
3. v. speak with a lisp