capo tasto

Century Dictionary and Cyclopedia

1. A contrivance attached to stringed instruments with frets, like the guitar, for the purpose of raising the pitch of all the strings at once. Also capo di tasto.

Wiktionary

1. n. alternative spelling of capotasto.

GNU Webster's 1913

1. (Music) A sort of bar or movable nut, attached to the finger board of a guitar or other fretted instrument for the purpose of raising uniformly the pitch of all the strings.