NOUN (1)

1. a male singing voice with artificially high tones in an upper register;


ADJECTIVE (1)

1. artificially high; above the normal voice range;
- Example: "a falsetto voice"

The Collaborative International Dictionary of English v.0.48:

high-pitched \high-pitched\ adj.
   1. high in pitch or frequency; -- used of sounds and voices.
      Opposite of low. [Narrower terms: adenoidal, pinched,
      nasal; altissimo; alto; countertenor, alto;
      falsetto; peaky, spiky; piping; shrill, sharp;
      screaky, screechy, squeaking, squeaky, squealing;
      soprano, treble; sopranino; tenor]

   Syn: high.
        [WordNet 1.5]

   2. set at a sharp or high angle or slant; as, a high-pitched
      roof.

   Syn: steeply pitched, steep.
        [WordNet 1.5] high-power

The Collaborative International Dictionary of English v.0.48:

Falsetto \Fal*set"to\, n.; pl. Falsettos. [It. falsetto, dim.
   fr. L. falsus. See False.]
   A false or artificial voice; that voice in a man which lies
   above his natural voice; the male counter tenor or alto
   voice. See Head voice, under Voice.
   [1913 Webster]

WordNet (r) 3.0 (2006):

falsetto
    adj 1: artificially high; above the normal voice range; "a
           falsetto voice"
    n 1: a male singing voice with artificially high tones in an
         upper register

Moby Thesaurus II by Grady Ward, 1.0:

77 Moby Thesaurus words for "falsetto":
   alto, aphonia, artificial voice, baritone, bass, bourdon, bravura,
   broken speech, broken tones, broken voice, burden, chest voice,
   childish treble, choked voice, choral, choric, coloratura,
   countertenor, cracked voice, croak, crow, dramatic, drone,
   drone bass, dysarthria, dyslalia, dyslogia, dysphasia, dysphonia,
   dysphrasia, harshness, hawking voice, head register, head tone,
   head voice, heroic, high, high-pitched, high-sounding, high-toned,
   hiss, hoarseness, hymnal, idioglossia, idiolalia,
   impairment of speech, lisp, lisping, liturgical, loss of voice,
   lyric, male alto, mezzo-soprano, muzzy speech, nasal tone,
   nasalization, operatic, psalmic, psalmodial, psalmodic, quaver,
   sacred, shake, sibilation, singing, soprano, speech defect,
   speech impediment, tenor, treble, tremor, twang, vocal, voce,
   voce di petto, voce di testa, voice