anode, cathode, control grid, electrode, grid

gastrostomy, aspirator, nozzle, calliper, venturi, catheter, suction, duct, platens, diaphragm, pipe, canula, mandrel, hose, endotracheal tube, vas deferens, cannula, pipette, reamer, crosshead, microchannel, downpipe, sigmoidoscope, capillary tube, plunger, speculum, knitting needle, abdominal cavity, spile, displacer, orifice, eductor, filament, valve, flange, impeller, pouch, cavity, cryostat, rod, thermoform, manometer, inlet manifold, coil, electrodes, nosepiece, tub, tappet, endoscope, extruder, curette, windings, cuvette, baseplate, stylet, toroid, suprarenal, coupler, thermos bottle, bobby pin, retractor, nostril, triaxial, thoracic duct, coiler, lamella, dipole antenna, microelectrode, spacer, superglue, contraption, inferior vena cava, sleeving, superheater, intestine, ballcock, triode, silicone, septa, karabiner, obturator, eye dropper, transducer, ferrule, dishpan, cystoscope, capillary, pericardial sac, clothespin, toroidal, dacron, spacers, hatpin, bobbin, embolus, ammeter, pulser, laryngoscope, tubules, collet, lubricator, bristle brush, tubes, lube, beaker, cylinder, flask, funnel, axle, chamber, spout, tank, cage, casing, dowel, diode, thermionic, crystal, modulation, potentiometric, quenching, rectifier, box, detector, finned, impedance, pneumatic, solidstate, steel, uninsulated, wave, agar, amp, anode

acorn tube, barrel, blowgun, blowpipe, blowtube, blow tube, burette, cannula, capillary, capillary tube, capillary tubing, cartilaginous tube, catheter, cathode-ray tube, chromatography column, cigarette holder, cochlea, coil, column, crt, diode, dropper, electron multiplier, eye dropper, gun barrel, hose, hosepipe, inner tube, klystron, magnetron, mouthpiece, pea shooter, pentode, pipage, pipe, pipette, piping, rectifying tube, rectifying valve, salpinx, siphon, speaking tube, stem, syphon, television-camera tube, television pickup tube, test tube, tetrode, tobacco pipe, torpedo tube, triode, tubule, vas, venturi, vessel, wellpoint, well point, x-ray tube

., abney level, acorn tube, afp, alcohol-in-glass thermometer, alcohol thermometer, alembic, alpha fetoprotein, alpha foetoprotein, ambulacrum, aristolochia durior, aristolochia macrophylla, atomic number 10, atresia, a battery, barrel, baster, blasting cap, block, blockage, blow, blowgun, blowpipe, blowtube, blow tube, bore, boron counter tube, brass, break seal, buret, burette, burned-out, b battery, calean, caliber, calibre, canal, cannula, cannulate, cannulation, cannulisation, cannulise, cannulization, cannulize, canulate, canulation, canulisation, canulization, capillary, capillary tube, capillary tubing, cartridge fuse, catheter, cathode-ray tube, cathode ray, channel, chicha, chromatography column, cigarette holder, clarinet, closure, cochlea, cockcroft-walton accelerator, cockcroft-walton voltage multiplier, cockcroft and walton accelerator, cockcroft and walton voltage multiplier, collimator, color television tube, color tube, color tv tube, colour television tube, colour tube, colour tv tube, column, control grid, cornet, crimper, cromorne, crookes tube, crt, crt screen, crumhorn, crystal counter, curler, cylindrical, c battery, dacryocystitis, de forest, diode, distortion, drain, drilling pipe, drinking straw, drive, driven well, dropper, duct, dutchman's-pipe, echinoderm, electric-discharge lamp, electron gun, electron multiplier, epithelial duct, erythrocyte sedimentation rate, esr, eudiometer, evacuated, extrusion, eye dropper, family terebellidae, fimbria, fistular, fistulate, fistulous, fluorescent lamp, flute, forced feeding, forebrain, french horn, funnel, gamopetalous, gas-discharge lamp, gas-discharge tube, gastrogavage, gauge, gavage, geiger-muller counter, geiger-muller tube, geiger counter, geiger tube, genlisea, genus masdevallia, genus terebella, glow lamp, glow tube, grid, gun, gun barrel, hair curler, holothurian, hookah, horn, hubble-bubble, hubbly-bubbly, hydraulic system, image orthicon, inner tube, intake, introitus, intubate, intubation, kaleidoscope, kalian, kinescope, klein bottle, klystron, krummhorn, lee de forest, level, liebig condenser, ligamentum teres uteri, magnetron, masdevallia, medulla spinalis, mercury-in-glass thermometer, mercury thermometer, micropyle, mosaic, mouthpiece, narghile, nargileh, nasogastric feeding, nasotracheal tube, ne, neon, neon induction lamp, neon lamp, neon tube, neural tube, occlusion, orthicon, patent, pea shooter, pentode, percolator, petrel, picture tube, pipage, pipe, pipet, pipette, pipe vine, piping, pitot-static tube, pitot tube, plate, proportional counter, proportional counter tube, prosencephalon, rectifying tube, rectifying valve, roller, round ligament of the uterus, safety fuse, salpingitis, salpinx, salverform, scintillation counter, screen, sea cucumber, sedimentation rate, sed rate, semicircular canal, sheesha, shisha, shunt, sieve tube, silencer, siphon, snorkel, sodium-vapor lamp, sodium-vapour lamp, speaking tube, spinal cord, spirit level, squib, stem, stent, stop, stoppage, straw, sympetalous, syphon, television-camera tube, television pickup tube, television tube, terebella, terebellidae, test tube, tetrode, the father of radio, tickler coil, tobacco pipe, torpedo tube, trachea, tracheostomy, tracheotomy, transverse flute, tricolor television tube, tricolor tube, tricolour television tube, tricolour tube, triode, trombone, trump, trumpet, tubal, tubal pregnancy, tube-shaped, tubed, tubeless, tubeless tire, tubelike, tube well, tubular cavity, tubule, vas, vasiform, venturi, vessel, water level, water pipe, water scorpion, wellpoint, well point, windpipe, x-ray tube

circuit, electrical circuit, electric circuit

anatomical structure, bodily structure, body structure, bring, channel, complex body part, conduit, convey, cylinder, electronic device, railroad, railroad line, railway, railway line, railway system, structure, take

electron tube, metro, pipe, subway, thermionic tube, thermionic vacuum tube, thermionic valve, tube-shaped structure, tubing, underground, vacuum tube