capo tasto

from The Century Dictionary.

• 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.

from the GNU version of the Collaborative International Dictionary of English.

• (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.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Alternative spelling of capotasto.