nounpl. -·tos or -·ti
- the words, or text, of an opera, oratorio, or other long choral work
- a book containing these words
Origin of librettoIt, diminutive of libro ( from Classical Latin liber), a book: see library
nounpl. li·bret·tos, or li·bret·ti
- The text of a dramatic musical work such as an opera, including the lyrics to be sung and sometimes interpolated spoken passages.
- A book containing such a text.
Origin of librettoItalian diminutive of libro book from Latin liber libr- inner bark of trees used as a writing material, book
(plural librettos or libretti)