The Collaborative International Dictionary of English v.0.48:

Baritone \Bar"i*tone\, a. & n.
   See Barytone.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Barytone \Bar"y*tone\, Baritone \Bar"i*tone\, a. [Gr.
   bary`tonos; bary`s heavy + to`nos tone.]
   1. (Mus.) Grave and deep, as a kind of male voice.
      [1913 Webster]

   2. (Greek Gram.) Not marked with an accent on the last
      syllable, the grave accent being understood.
      [1913 Webster] Barytone

The Collaborative International Dictionary of English v.0.48:

Barytone \Bar"y*tone\, Baritone \Bar"i*tone\, n. [F. baryton:
   cf. It. baritono.]
   1. (Mus.)
      (a) A male voice, the compass of which partakes of the
          common bass and the tenor, but which does not descend
          as low as the one, nor rise as high as the other.
      (b) A person having a voice of such range.
      (c) The viola di gamba, now entirely disused.
          [1913 Webster]

   2. (Greek Gram.) A word which has no accent marked on the
      last syllable, the grave accent being understood.
      [1913 Webster]

WordNet (r) 3.0 (2006):

baritone
    adj 1: lower in range than tenor and higher than bass; "a
           baritone voice"; "baritone oboe"
    n 1: a male singer [syn: baritone, barytone]
    2: the second lowest adult male singing voice [syn: baritone,
       baritone voice]
    3: the second lowest brass wind instrument [syn: baritone,
       baritone horn]

Moby Thesaurus II by Grady Ward, 1.0:

161 Moby Thesaurus words for "baritone":
   Heldentenor, Meistersinger, accompaniment, alpenhorn, alphorn,
   althorn, alto, alto horn, aria singer, ballad horn, baritenor,
   bass, bass horn, bass viol, basso, basso buffo, basso cantante,
   basso continuo, basso ostinato, basso profundo, bassus,
   blues singer, brass choir, brass wind, brass-wind instrument,
   brasses, bravura, bugle, bugle horn, canary, cantatrice, canto,
   cantor, cantus, cantus figuratus, cantus planus, caroler, chanter,
   chantress, choral, choric, clarion, coloratura, coloratura soprano,
   comic bass, continuo, contralto, cornet, cornet-a-pistons,
   corno di caccia, cornopean, countertenor, crooner, deep, deep bass,
   deep-echoing, deep-pitched, deep-toned, deepmouthed, descant,
   descant viol, diva, double-bell euphonium, dramatic,
   dramatic soprano, drone, euphonium, falsetto, figured bass, grave,
   ground bass, heavy, helicon, heroic, heroic tenor, hollow, horn,
   hunting horn, hymnal, hymner, improvisator, key trumpet,
   lead singer, lieder singer, line, liturgical, lituus, low,
   low-pitched, lur, lyric, mellophone, melodist, mezzo-soprano,
   opera singer, operatic, ophicleide, orchestral horn, part,
   plain chant, plain song, pocket trumpet, post horn, prick song,
   prima donna, psalm singer, psalmic, psalmodial, psalmodic, rebec,
   rock-and-roll singer, sackbut, sacred, saxhorn, saxtuba,
   sepulchral, serpent, singer, singing, singstress, slide trombone,
   sliphorn, songbird, songster, songstress, soprano, sousaphone,
   tenor, tenor tuba, tenor viol, thorough bass, torch singer, treble,
   treble viol, tromba, tromba marina, trombone, trumpet,
   trumpet marine, tuba, undersong, valve trombone, valve trumpet,
   vielle, viol, viol family, viola bastarda, viola da braccio,
   viola da gamba, viola da spalla, viola di bordone,
   viola di fagotto, viola pomposa, violette, vocal, vocalist,
   vocalizer, voice, voice part, warbler, yodeler