| pleximeter | (noun) a small thin metal plate held against the body and struck with a plexor in percussive examinations | Synonyms: plessimeter |
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| pluviometer | (noun) gauge consisting of an instrument to measure the quantity of precipitation | Synonyms: rain gage, rain gauge, udometer |
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| polarimeter | (noun) an optical device used to measure the rotation of the plane of vibration of polarized light | Synonyms: polariscope |
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| potentiometer | (noun) a resistor with three terminals, the third being an adjustable center terminal; used to adjust voltages in radios and TV sets | Synonyms: pot |
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| (noun) a measuring instrument for measuring direct current electromotive forces | - |
| psychrometer | (noun) a hygrometer consisting of a dry-bulb thermometer and a wet-bulb thermometer; their difference indicates the dryness of the surrounding air | - |
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| pyrometer | (noun) a thermometer designed to measure high temperatures | - |
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| radiometer | (noun) meter to detect and measure radiant energy (electromagnetic or acoustic) | - |
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| radiomicrometer | (noun) radiometer that is extremely sensitive | - |
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| reflectometer | (noun) a meter that measures the reflectance of a surface | - |
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| refractometer | (noun) measuring instrument for measuring the refractive index of a substance | - |
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| rheometer | (noun) an instrument for measuring the flow of liquids (especially arterial blood) | - |
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| riveter | (noun) a machine for driving rivets | Synonyms: riveting machine, rivetter |
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| (noun) a worker who inserts and hammers rivets | Synonyms: rivetter |
| salinometer | (noun) a hydrometer that determines the concentration of salt solutions by measuring their density | - |
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| saltpeter | (noun) (KNO3) used especially as a fertilizer and explosive | Synonyms: niter, nitre, potassium nitrate, saltpetre |
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| sclerometer | (noun) a measuring instrument that measures the hardness of materials by penetrating them with a stylus that has a diamond point | - |
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| secreter | (noun) any of various organs that synthesize substances needed by the body and release it through ducts or directly into the bloodstream | Synonyms: gland, secretor, secretory organ |
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| semidiameter | (noun) the apparent radius of a celestial body when viewed as a disc from the earth | - |
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| sensitometer | (noun) a measuring instrument for measuring the light sensitivity of film over a range of exposures | - |
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| sonometer | (noun) an instrument used to measure the sensitivity of hearing | Synonyms: audiometer |
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| spectrometer | (noun) spectroscope for obtaining a mass spectrum by deflecting ions into a thin slit and measuring the ion current with an electrometer | Synonyms: mass spectrometer |
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| spectrophotometer | (noun) a photometer for comparing two light radiations wavelength by wavelength | - |
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| speedometer | (noun) a meter fixed to a vehicle that measures and displays its speed | Synonyms: speed indicator |
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| spherometer | (noun) a measuring instrument for measuring the curvature of a surface | - |
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| sphygmomanometer | (noun) a pressure gauge for measuring blood pressure | - |
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| spirometer | (noun) a measuring instrument for measuring the vital capacity of the lungs | - |
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| stactometer | (noun) a device for investigating surface tension using the stalagmometric method. | Synonyms: stalagmometer, stalogometer |
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| stalagmometer | (noun) a device for investigating surface tension using the stalagmometric method. | Synonyms: stactometer, stalogometer |
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| stalogometer | (noun) a device for investigating surface tension using the stalagmometric method. | Synonyms: stactometer, stalagmometer |
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| supermarketer | (noun) an operator of a supermarket | Synonyms: supermarketeer |
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| tacheometer | (noun) a theodolite designed for rapid measurements | Synonyms: tachymeter |
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| tachometer | (noun) measuring instrument for indicating speed of rotation | Synonyms: tach |
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| tachymeter | (noun) a theodolite designed for rapid measurements | Synonyms: tacheometer |
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| taximeter | (noun) a meter in a taxi that registers the fare (based on the length of the ride) | - |
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| teeter | (noun) a plaything consisting of a board balanced on a fulcrum; the board is ridden up and down by children at either end | Synonyms: dandle board, seesaw, teeter-totter, teeterboard, teetertotter, tilting board |
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| (verb) move unsteadily, with a rocking motion | Synonyms: seesaw, totter |
| telemeter | (noun) any scientific instrument for observing events at a distance and transmitting the information back to the observer | - |
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| telethermometer | (noun) a thermometer that registers the temperature at some distant point | - |
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| tensimeter | (noun) a manometer for measuring vapor pressure | - |
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| tensiometer | (noun) a measuring instrument for measuring the surface tension of a liquid | - |
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| (noun) a measuring instrument for measuring the tension in a wire or fiber or beam | - |
| (noun) a measuring instrument for measuring the moisture content of soil | - |
| tetrameter | (noun) a verse line having four metrical feet | - |
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| thermogravimeter | (noun) a hydrometer that includes a thermometer | Synonyms: thermohydrometer |
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| thermohydrometer | (noun) a hydrometer that includes a thermometer | Synonyms: thermogravimeter |
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| thermometer | (noun) measuring instrument for measuring temperature | - |
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| tintometer | (noun) a measuring instrument used in colorimetric analysis to determine the quantity of a substance from the color it yields with specific reagents | Synonyms: colorimeter |
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| tonometer | (noun) measuring instrument for measuring tension or pressure (especially for measuring intraocular pressure in testing for glaucoma) | - |
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| trumpeter | (noun) large gregarious crane-like bird of the forests of South America having glossy black plumage and a loud prolonged cry; easily domesticated | - |
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| (noun) large pure white wild swan of western North America having a sonorous cry | Synonyms: Cygnus buccinator, trumpeter swan |
| (noun) a musician who plays the trumpet or cornet | Synonyms: cornetist |
| (noun) (formal) a person who announces important news | Synonyms: herald |
| tweeter | (noun) a loudspeaker that reproduces higher audio frequency sounds | - |
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| udometer | (noun) gauge consisting of an instrument to measure the quantity of precipitation | Synonyms: pluviometer, rain gage, rain gauge |
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| ureter | (noun) either of a pair of thick-walled tubes that carry urine from the kidney to the urinary bladder | - |
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| variometer | (noun) a measuring instrument for measuring variations in a magnetic field | - |
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| viscometer | (noun) a measuring instrument for measuring viscosity | Synonyms: viscosimeter |
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| viscosimeter | (noun) a measuring instrument for measuring viscosity | Synonyms: viscometer |
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| voltmeter | (noun) meter that measures the potential difference between two points | - |
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| volumeter | (noun) a meter to measure the volume of gases, liquids, or solids (either directly or by displacement) | - |
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| wattmeter | (noun) an instrument for measuring in watts the flow of power in an electrical circuit | - |
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| xylometer | (noun) an instrument used to determine the specific gravity of wood | - |
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