ampulla

ductwork, ventilation, radiator, vents, flue pipe, condenser, pipework, cavity, downpipe, firebox, valve, hose, coils, heat exchanger, intercooler, nozzle, soffit, airflow, floor joist, baseboard, flue, piping, tube, attic, evaporator, manway, sump, stopcock, diaphragm, chimney, dehumidifying, subfloor, louvers, peritoneal cavity, humidistat, compressor, impeller, flange, crawlspace, inferior vena cava, cryostat, underfloor, ventilating, water heater, exhaust pipe, membrane, abdominal cavity, crossflow, furnace, penstock, anal canal, vas deferens, tubules, trachea, ventilation shaft, drip pan, exhaust manifold, pleural cavity, ascending aorta, platens, busbar, hydronic, blower, plenums, economizer, steam boiler, intestine, venturi, gland, plumbing, combustion chamber, immersion heater, heater, suction, intake valve, upflow, cannula, gasket, wiring, macerator, mandrel, shaft, nailer, karabiner, lobules, dryer, chest cavity, sleeving, spermatic cord, lamella, microswitch, ferrule, iliac artery, microchannel, nasal cavity, torus, piston rod, louvres, radiant heating, inlet manifold, compressed air, parison, ducts, ampulla, segment, bronchus, canal, tubule, aperture, loop, orifice, groove, orifices, pedicle, canals, fin, foramen, ductal, ureteric, sebaceous, ureteral, epidermal, ampullary, intraductal, intrahepatic, mammary, oesophageal, rectal, endometrial, parotid, popliteal, urethral, bile, bronchial, extrahepatic, fallopian, follicular

air-intake, airway, air duct, air passage, alimentary canal, alimentary tract, aqueductus cerebri, bile duct, canaliculus, canalis cervicis uteri, canalis vertebralis, cerebral aqueduct, cervical canal, common bile duct, digestive tract, digestive tube, ductule, ductulus, ejaculatory duct, epididymis, gastrointestinal tract, gi tract, hepatic duct, lachrymal duct, lacrimal duct, lymphatic vessel, lymph vessel, pancreatic duct, pore, salivary duct, seminal duct, sinus, spinal canal, sylvian aqueduct, umbilical cord, ureter, urethra, vagina, vas deferens, venous sinus, vertebral canal

air-intake, airway, air duct, air passage, ampulla, angiitis, bile duct, canaliculus, cartilaginous tube, common bile duct, ductless, ductule, ductulus, ductus deferens, duct gland, duct tape, ejaculatory duct, exocrine gland, hepatic duct, lacteal, laticifer, ligation, lymphatic vessel, lymph vessel, musculus sphincter ductus choledochi, musculus sphincter ductus pancreatici, nasolacrimal duct, pancreatic duct, passage, passageway, patency, salivary duct, seminal duct, sweat duct, thoracic duct, umbilical cord, urethra, vas deferens

tracheophyte, vascular plant

channel, conduit, passage, passageway, plant part

canal, channel