Noun | 1. | ![]() flue pipe, labial pipe, flue - organ pipe whose tone is produced by air passing across the sharp edge of a fissure or lip pipe organ, organ - wind instrument whose sound is produced by means of pipes arranged in sets supplied with air from a bellows and controlled from a large complex musical keyboard organ stop - a graduated set of organ pipes of like tone quality reed pipe - organ pipe with a vibrating reed wind instrument, wind - a musical instrument in which the sound is produced by an enclosed column of air that is moved by the breath |