sordine
/soʊrˈdiːneɪ/Definitions
1. noun
A type of stage curtain or a screen used in opera houses.
“The sordine was slowly raised to reveal the performers on stage.”
2. noun
A device on an organ or other keyboard instrument that mutes the sound of certain notes, typically used to correct pitch.
“The organist carefully adjusted the sordine to produce a perfect pitch.”