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. Gamba [noun] - A string stop, usually metal. Gedeckt [noun] - A stopped flute, wood or metal, equivalent to the French Bourdon or the English Stopped Diapason. Gemshorn [noun] - A hybrid stop with a tone between a string and a flute. Usually made of tapered metal pipes. General [noun] - short for "General Piston". Grille Groove Groove Valve