n. A woodwind instrument which was the predecessor of the clarinet.
n. The lowest range of the clarinet, reaching up to written B♭ (B flat) above middle C.
The Century Dictionary and Cyclopedia
n. An obsolete musical instrument, probably of the clarinet class. See shawm.
n. The lowest portion or register of the scale of the clarinet and of the basset-horn.
Word Usage
"The scale of the original instrument is still called chalumeau by the clarinet player; about the middle of the last century it was extended down to E."