These pages comprise a dictionary of terms relating to the pipe organ. Please keep definitions to a few sentences, and do not include pictures or sound clips. When more space is needed for a term, a new page can be created for it. Ears [noun] metal or wooden tabs protruding from the sides of the mouth of the flue pipe, parallel to the pipe body and perpendicular to the mouth. Sometimes used to support harmonic bridges. Echo Organ [noun] - synonym for Echo Division. Echowerk - German synonym for "Echo Organ" or "Echo Division". En Chamade see chamade. English Swell Exhaust Valve Exhaust-Pneumatic