1. The written words of an opera, &c.; the book containing them.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• loretto,
• librety,
• capretto,
• kibretto,
• pibretto,
• oibretto,
• lubretto,
• ljbretto,
• lkbretto,
• lobretto,
• l9bretto,
• l8bretto,
• livretto,
• linretto,
• libretti,
• liberetto,
• librretto,
• libreto,
• librettos,
• liberto

• lip-read,
• libration,
• liebert,
• librettist,
• liberate,
• liberator,
• librate.

The adjective form of "libretto" is "librettiary".