<p><strong>noun</strong></p><ul><li>a hollow cylinder of metal, wood, or other material, used for the conveyance of water, gas, steam, petroleum, etc.</li><li>a tube of wood, clay, hard rubber, or other material, with a small bowl at one end, used for smoking tobacco, opium, etc.</li><li>a quantity, as of tobacco, that fills the bowl of such a smoking utensil.</li><li>Music. a tube used as, or to form an essential part of, a musical wind instrument.</li><li>a musical wind instrument consisting of a single tube of straw, reed, wood, or other material, as a flute, clarinet, or oboe.</li><li>one of the wooden or metal tubes from which the tones of an organ are produced.</li><li>a small end-blown flute played with one hand while the other beats a small drum.</li><li>Nautical. boatswain's pipe.</li><li>the sound of a boatswain's pipe.</li><li>the call or utterance of a bird, frog, etc.</li><li>pipes, Informal. the human vocal cords or the voice, especially as used in singing.</li><li>Usually pipes. Music. bagpipe.</li><li>a set of flutes, as a panpipe.</li><li>Informal. a tubular organ or passage of a human or animal body, especially a respiratory passage: to complain of congested pipes.</li><li>any of various tubular or cylindrical objects, parts, or formations, as an eruptive passage of a volcano or geyser.</li><li>Mining. a cylindrical vein or body of ore.</li><li>(in South Africa) a vertical, cylindrical matrix, of intrusive igneous origin, in which diamonds are found.</li><li>Metallurgy. a depression occurring at the center of the head of an ingot as a result of the tendency of solidification to begin at the bottom and sides of the ingot mold.</li><li>Botany. the stem of a plant.</li></ul><p><strong>verb</strong></p><ul><li>(used without object) piped, pip·ing. to play on a pipe.</li><li>Nautical. to signal, as with a boatswain's pipe.</li><li>to speak in a high-pitched or piercing tone.</li><li>to make or utter a shrill sound like that of a pipe: songbirds piping at dawn.</li><li>(used with object) piped, pip·ing. to convey by or as by pipes: to pipe water from the lake.</li><li>to supply with pipes.</li><li>to play (music) on a pipe or pipes.</li><li>to summon, order, etc., by sounding the boatswain's pipe or whistle: all hands were piped on deck.</li><li>to bring, lead, etc., by or as by playing on a pipe: to pipe dancers.</li><li>to utter in a shrill tone: to pipe a command.</li><li>to trim or finish with piping, as an article of clothing.</li><li>Cooking. to force (dough, frosting, etc.) through a pastry tube onto a baking sheet, cake, or pie, etc.</li><li>Informal. to convey by an electrical wire or cable: to pipe a signal from the antenna.</li><li>Slang. to look at; notice: Pipe the cat in the hat.</li><li>verb phrase Slang. to stop talking; be quiet: He shouted at us to pipe down.</li><li>to begin to play (a musical instrument) or to sing.</li><li>to make oneself heard; speak up, especially as to assert oneself.</li><li>to increase in velocity, as the wind.</li></ul>