sourdine

[soo r-deen] /sʊərˈdin/
noun, Music.
1.
mute (def 10).
2.
kit2 .
3.
an obsolete member of the oboe family.
Origin
1670-80; < French: damper, mute < Italian sordina (feminine); see sordino
British Dictionary definitions for sourdine

sourdine

/sʊəˈdiːn/
noun (music)
1.
a soft stop on an organ or harmonium
2.
another word for sordino
Word Origin
C17 (meaning: a muted trumpet): from French: a mute, from Italian; see sordino