#conduit__channel  a passage for water (or other fluids)
  supertype:  passage.way  a way through or along which someone or something may pass
  subtype:  aqueduct  a conduit that resembles a bridge but carries water over a valley
  subtype:  canal  long and narrow strip of water made for boats or for irrigation
     subtype:  cut.canal  a canal made by erosion or excavation
     subtype:  industrial_watercourse  a canal that is operated by one or more industries
     subtype:  raceway__race  a canal for a current of water
     subtype:  ship_canal__shipway  a canal large enough for sea-going vessels
        subtype:  Panama_Canal  a ship canal 40 miles long across the Isthmus of Panama built by the United State (1904-1914)
        instance:  Suez_Canal
     instance:  Erie_Canal  New_York_State_Barge_Canal
  subtype:  duct.conduit  an enclosed conduit for a fluid
     subtype:  air-intake__airintake  a duct that admits air to be mixed with fuel
     subtype:  air_passage__airpassage__air_duct__airduct__airway  a duct that provides ventilation as in mines
        subtype:  register.air_passage  an air passage (usually in the floor or a wall of a room) for admitting or excluding heated air from the room
        subtype:  snorkel_breather__snorkelbreather__snorkel__schnorchel__breather  air passage provided by a retractable device containing intake and exhaust pipes; permits a submarine to stay submerged for extended periods of time
        subtype:  upcast  air passage consisting of a ventilation shaft through which air leaves a mine
        subtype:  ventilation_shaft__ventilationshaft  a shaft in a building; serves as an air passage for ventilation
  subtype:  flue  a conduit to carry off smoke
     subtype:  chimney  a vertical flue that provides a path through which smoke from a fire is carried away through the wall or roof of a building
        subtype:  smokestack__stack  a large tall chimney through which combustion gases and smoke can be evacuated
           subtype:  funnel  smokestack consisting of a shaft for ventilation or the passage of smoke (especially the smokestack of a ship)
        subtype:  stovepipe  chimney consisting of a metal pipe of large diameter that is used to connect a stove to a flue
     subtype:  chimneystack  the part of the chimney that is above the roof; usually has several flues
     subtype:  lamp_chimney__chimney  a glass flue surrounding the wick of an oil lamp
  subtype:  gutter__trough  a channel along the eaves or on the roof; collects and carries away rainwater
     subtype:  chute__slideway__sloping_trough__slopingtrough  sloping channel through which things can descend
        subtype:  coal_chute  a chute for coal
        subtype:  water_chute__waterchute  chute with flowing water down which toboggans and tubes and people slide into a pool
     subtype:  cullis  a gutter in a roof
  subtype:  millrace__millrun  a channel for the water current that turns a millwheel
  subtype:  sluice__sluiceway__penstock  conduit that carries a rapid flow of water controlled by a sluicegate
  subtype:  spillway__spill__wasteweir  a channel that carries excess water over or around a dam or other obstruction
  subtype:  tubing__tube  conduit consisting of a long hollow object (usually cylindrical) used to hold and conduct liquids or gases
     subtype:  gun_barrel__gunbarrel__barrel  a tube through which a bullet travels when a gun is fired
     subtype:  blowgun__blowpipe__blowtube__blow_tube  a tube through which darts can be shot by blowing
     subtype:  cannula  a small flexible tube inserted into a body cavity for draining off fluid or introducing medication
     subtype:  capillary_tubing__capillarytubing__capillary__capillary_tube__capillarytube  a tube of small internal diameter; holds liquid by capillary action
     subtype:  catheter  a thin flexible tube inserted into the body to permit introduction or withdrawal of fluids or to keep the passageway open
        subtype:  endotracheal_tube  a catheter that is inserted into the trachea through the mouth or nose in order to maintain an open air passage or to deliver oxygen or to permit the suctioning of mucus or to prevent aspiration of the stomach contents
           subtype:  nasotracheal_tube  a tube inserted into the trachea through the nose and pharynx; used to deliver oxygen
     subtype:  cigarette_holder__cigaretteholder  a tube that holds a cigarette while it is being smoked
     subtype:  coil.tubing  tubing that is wound in a spiral
        subtype:  condenser  a hollow coil that condenses by abstracting heat
     subtype:  chromatography_column__column  a vertical glass tube used in column chromatography; a mixture is poured in the top and washed through a stationary substance where components of the mixture are adsorbed selectively to form colored bands
     subtype:  drain.tubing  tube inserted into a body cavity (as during surgery) to remove unwanted material
     subtype:  hosepipe__hose  a flexible pipe for conveying a liquid or gas
        subtype:  airline__air_hose__airhose  a hose that carries air under pressure
        subtype:  fire_hose  a large hose that carries water from a fire hydrant to the site of the fire
        subtype:  garden_hose  a hose used for watering a lawn or garden
        subtype:  radiator_hose  a flexible hose between the radiator and the engine block
        subtype:  water_cannon__watercannon__watercannon  a hose (carried on a truck) that fires water under high pressure to disperse crowds (especially crowds of rioters)
     subtype:  inner_tube__innertube  an inflatable rubber tube that fits inside the casing of a pneumatic tire
     subtype:  mouthpiece.tubing  the tube of a pipe or cigarette holder that a smoker holds in the mouth
     subtype:  pea_shooter__peashooter  a straight narrow tube through which pellets (as dried peas) can be blown at a target
     subtype:  pipe__pipage__piping  a long tube made of metal or plastic that is used to carry water or oil or gas etc.
        subtype:  chimneypot  a short earthenware pipe on the top of a chimney to increase the draft
        subtype:  discharge_pipe__dischargepipe  a pipe through which fluids can be discharged
           subtype:  hydrant  a discharge pipe with a valve and spout at which water may be drawn from the mains of waterworks
              subtype:  fireplug__fire_hydrant__plug  an upright hydrant for drawing water to use in fighting a fire
        subtype:  drainpipe__drain__waste_pipe__wastepipe  a pipe through which liquid is carried away
           subtype:  culvert  a transverse and totally enclosed drain under a road or railway
           subtype:  scupper  drain that allows water on the deck of a vessel to flow overboard
           subtype:  sewerage__sewer__cloaca  a waste pipe that carries away sewage or surface water
           subtype:  soil_pipe  drain that conveys liquid waste from toilets, etc.
           subtype:  trap.drainpipe  drain consisting of a U-shaped section of drainpipe that holds liquid and so prevents a return flow of sewer gas
        subtype:  drilling_pipe  a series of tube (joined by screwed collars) that connects a drilling platform to the drilling bit; rotates the bit and supplies drilling mud
        subtype:  elbow.pipe  a length of pipe with a sharp bend in it
        subtype:  exhaust_pipe__exhaustpipe  a pipe through which burned gases travel from the exhaust manifold to the muffler
        subtype:  fuel_line__gas_line__gasline  a pipe that carries gasoline from a tank to a gasoline engine; "the car wouldn't start because dirt clogged the gas line"
        subtype:  main  a principal pipe in a system that distributes water or gas or electricity or that collects sewage
           subtype:  electric_main  a main that distributes electricity
           subtype:  gas_main__gasmain  a main that distributes gas
           subtype:  sewer_main__sewermain__sewer_line__sewerline  a main in a sewage system
           subtype:  water_main__watermain  main (a pipe or conduit) for conveying water
        subtype:  manifold  a pipe that has several lateral outlets to or from other pipes
           subtype:  exhaust_manifold__exhaustmanifold  a manifold that receives exhaust gases from the cylinders and conducts them to the exhaust pipe
           subtype:  inlet_manifold__inletmanifold  manifold that carries vaporized fuel from the carburetor to the inlet valves of the cylinders
           subtype:  intake_manifold  a manifold consisting of a pipe to carry fuel to each cylinder in an internal-combustion engine
        subtype:  pipeline__line  a pipe used to transport liquids or gases; "a pipeline runs from the wells to the seaport"
           subtype:  Alaskan_pipeline__trans-Alaska_ppipeline  an oil pipeline that runs 800 miles from wells at Prudhoe Bay to the port of Valdez
           subtype:  gas_line__gasline  a pipeline used to transport natural gas; "the workmen broke through the gas line"
           subtype:  oil_pipeline__oilpipeline  a pipeline used to transport oil
        subtype:  standpipe  a vertical pipe
        subtype:  steam_line__steamline__steam_pipe__steampipe  a pipe conducting steam
        subtype:  tailpipe  a pipe carrying fumes from the muffler to the rear of a car
     subtype:  tobacco_pipe__tobaccopipe__pipe  a tube with a small bowl at one end; used for smoking tobacco
        subtype:  briar_pipe__briarpipe__briar  a pipe made from the root (briarroot) of the tree heath
        subtype:  calumet__peace_pipe__peacepipe__pipe_of_peace  a highly decorated ceremonial pipe of Amerindians; smoked on ceremonial occasions (especially as a token of peace)
        subtype:  clay_pipe  a pipe made of clay
           subtype:  dudeen  a clay pipe with a short stem
        subtype:  hookah__hubble-bubble__kalian__narghile__water_pipe__waterpipe  a pipe with a long flexible tube connected to a container where the smoke is cooled by passing through water
        subtype:  meerschaum  a pipe having a bowl made of meerschaum
     subtype:  silencer  short tube attached to the muzzle of a gun the deaden the sound of firing
     subtype:  siphon__syphon  a tube running from the liquid in a vessel to a lower level outside the vessel so that atmospheric pressure forces the liquid through the tube
     subtype:  speaking_tube  a tube for conveying the sound of a voice from one room to another
     subtype:  stem  the tube of a tobacco pipe
     subtype:  drinking_straw__straw  a thin paper or plastic tube used to such liquids into the mouth
     subtype:  test_tube  glass tube closed at one end
     subtype:  torpedo_tube__torpedotube  a tube near the waterline of a vessel through which a torpedo is fired
     subtype:  venturi  a tube with a constriction; used to control fluid flow (as in the air inlet of a carburetor)
     subtype:  well_point__wellpoint  a perforated tube driven into the ground to collect water from the surrounding area
  subtype:  watercourse.conduit__waterway  a conduit through which water flows
     subtype:  flume  watercourse that consists of an open artificial chute filled with water for power or for carrying logs
     subtype:  headrace  a waterway that feeds water to a mill or water wheel or turbine
     subtype:  tailrace  a watercourse that carries water away from a mill or water wheel or turbine
  subtype:  waterspout  a channel through which water is discharged (especially one used for drainage from the gutters of a roof)

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