| thermogravimeter | (noun) a hydrometer that includes a thermometer | Synonyms: thermohydrometer |
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| thermogravimetry | (noun) the measurement of changes in weight as a function of changes in temperature used as a technique of chemically analyzing substances | - |
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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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| thermometrograph | (noun) a thermometer that records temperature variations on a graph as a function of time | Synonyms: thermograph |
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| thermometry | (noun) the measurement of temperature | - |
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| timetable | (noun) a schedule of times of arrivals and departures | - |
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| (noun) a schedule listing events and the times at which they will take place | - |
| 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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| tonometry | (noun) the measurement of intraocular pressure by determining the amount of force needed to make a slight indentation in the cornea | - |
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| tribromomethane | (noun) colorless liquid haloform CHBr3 | Synonyms: bromoform |
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| trichlormethiazide | (noun) diuretic drug (trade name Naqua) used to treat hypertension | Synonyms: Naqua |
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| trichloromethane | (noun) a volatile liquid haloform (CHCl3); formerly used as an anesthetic | Synonyms: chloroform |
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| trifluoromethane | (noun) colorless gas haloform CHF3 (similar to chloroform) | Synonyms: fluoroform |
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| trigonometrician | (noun) a mathematician specializing in trigonometry | - |
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| trigonometry | (noun) the mathematics of triangles and trigonometric functions | Synonyms: trig |
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| triiodomethane | (noun) a yellowish crystalline solid with a penetrating odor; sometimes used as an antiseptic dressing | Synonyms: iodoform |
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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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| 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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| viscometry | (noun) the measurement of viscosity | Synonyms: viscosimetry |
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| viscosimeter | (noun) a measuring instrument for measuring viscosity | Synonyms: viscometer |
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| viscosimetry | (noun) the measurement of viscosity | Synonyms: viscometry |
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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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