D defs.my
Entry 2 senses Webster, 1913

Canto

/kăn'-tō/ · Can·to · IPA /ˈkæntoʊ/
01 n. One of the chief divisions of a long poem; a book.
pl. Cantos ((#))
  1. 1.
    One of the chief divisions of a long poem; a book.
  2. 2.
    The highest vocal part; the air or melody in choral music; anciently the tenor, now the soprano.(Mus.)
Phrases & compounds
‖Canto fermo — the plain ecclesiastical chant in cathedral service; the plain song.