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organ 
Wind instrument with several keyboards; it produces sound by means of pipes that are fed by a blower.
flue pipe 
Pipe that vibrates when pressurized air passes through a narrow horizontal aperture called the mouth.
flue 
Narrow slit through which air from the foot passes after hitting the languid.
lower lip 
Flat portion of the foot; it forces air onto the languid.
mouth 
Horizontal aperture on the front of the pipe between the body and the foot; air escapes through it to produce sound.
upper lip 
Flat part of the pipe that breaks up the air exiting the flue, causing the air column in the body to vibrate.
body 
Upper part of the pipe; it controls the volume of vibrating air and acts as a resonator.
languid 
Metal plate that the air strikes before exiting the flue.