EXAMPLES FROM THE WEB FOR SORDINO
He was using a sordino and playing it very softly; but I was not mistaken.
A sordino, or boat-shaped pochette; English, seventeenth century.
A sordino, or pochette, by "Baptista Bressano," supposed to date from the end of the fifteenth century.
Another modification of tone is caused by placing a tiny instrument called a sordino, or mute, upon the bridge.