designating or of any of a group of woodwind instruments, as the oboe or bassoon, having two reeds that are separated by a narrow opening and vibrated against each other by the breath
noun
a double-reed instrument
See double-reed in American Heritage Dictionary 4
noun
A pair of joined reeds that vibrate together to produce sound in certain wind instruments, such as bassoons and oboes.
An instrument in which sound is produced by a pair of joined reeds.