Late 18th century; earliest use found in John Hawkins (1719–1789), music scholar and lawyer. From German †Busaune trombone, organ stop resembling a trombone in tone, variant of Posauneposaune.
Definition of busaun in US English:
busaun
nounbuːˈzaʊn
Music rare
= posaune. Now historical.
Origin
Late 18th century; earliest use found in John Hawkins (1719–1789), music scholar and lawyer. From German † Busaune trombone, organ stop resembling a trombone in tone, variant of Posaune posaune.