[1] : The Collaborative International Dictionary of English v.0.48

canto \can"to\, n.; pl. cantos. it. canto, fr. l. cantus
   singing, song. see chant.
   1. one of the chief divisions of a long poem; a book.
      1913 webster

   2. mus. the highest vocal part; the air or melody in choral
      music; anciently the tenor, now the soprano.
      1913 webster

   canto fermoit. mus., the plain ecclesiastical chant in
      cathedral service; the plain song.
      1913 webster
see also:
cantos chant canto fermo 

[2] : WordNet (r) 2.0

canto
     n 1: the highest part usually the melody in a piece of choral
          music
     2: a major division of a long poem

[3] : Moby Thesaurus II by Grady Ward, 1.0

75 moby thesaurus words for "canto":
   spenserian stanza, accompaniment, air, alto, antistrophe, aria,
   baritone, bass, basso continuo, basso ostinato, bassus, book,
   burden, cantus, cantus figuratus, cantus planus, chorus, continuo,
   contralto, couplet, descant, distich, drone, envoi, epode,
   figured bass, ground bass, heptastich, hexastich, lay, line,
   measure, melodia, melodic line, melody, monostich, note, octastich,
   octave, octet, ottava rima, part, pentastich, plain chant,
   plain song, prick song, quatrain, refrain, rhyme royal, septet,
   sestet, sextet, solo, solo part, song, soprano, soprano part,
   stanza, stave, strain, strophe, syllable, tenor, tercet,
   terza rima, tetrastich, thorough bass, treble, triplet, tristich,
   tune, undersong, verse, voice, voice part

Canto >> C Words
Canto, definition of term: Canto
canto_pag1.html

Bel Canto >> B Words
Bel Canto, definition of term: Bel Canto
bel+canto_pag1.html