chalumeau

1a :  a medieval wind instrument consisting of an upright tube surmounted by a small tube in which was fixed a double reed :  shawm b :  an obsolete single-reed wind instrument of varying size that after progressive modifications became the clarinet

2 :  chanter 3

3 :  the lowest register of the clarinet —often used as a direction to play a passage an octave lower

4 :  a reed organ pipe usually of 8-foot pitch and of clarinetlike tone —called also schalmei