| milliammeter | (noun) a sensitive ammeter graduated in milliamperes | - |
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| millimeter | (noun) a metric unit of length equal to one thousandth of a meter | Synonyms: millimetre, mm |
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| millimetre | (noun) a metric unit of length equal to one thousandth of a meter | Synonyms: millimeter, mm |
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| millivoltmeter | (noun) sensitive voltmeter that can measure voltage in millivolts | - |
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| milometer | (noun) a meter that shows mileage traversed | Synonyms: hodometer, mileometer, odometer |
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| mnemometer | (noun) An outdated mechanical device used for presenting a series of stimuli to be memorized. | Synonyms: memory apparatus |
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| monometallism | (noun) the use of only one metal (such as gold or silver) in the standard currency of a country, or as a standard of monetary value. | - |
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| myometritis | (noun) inflammation of the myometrium | - |
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| myometrium | (noun) the smooth muscle forming the wall of the uterus | - |
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| myriameter | (noun) a metric unit of length equal to 10,000 meters | Synonyms: mym, myriametre |
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| myriametre | (noun) a metric unit of length equal to 10,000 meters | Synonyms: mym, myriameter |
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| nabumetone | (noun) a nonsteroidal anti-inflammatory drug (trade name Relafen) | Synonyms: Relafen |
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| nanometer | (noun) a metric unit of length equal to one billionth of a meter | Synonyms: micromillimeter, micromillimetre, millimicron, nanometre, nm |
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| nanometre | (noun) a metric unit of length equal to one billionth of a meter | Synonyms: micromillimeter, micromillimetre, millimicron, nanometer, nm |
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| nitrochloromethane | (noun) gaseous form of chloropicrin used as tear gas | - |
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| nonmetal | (noun) a chemical element lacking typical metallic properties | - |
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| octameter | (noun) a verse line having eight metrical feet | - |
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| odometer | (noun) a meter that shows mileage traversed | Synonyms: hodometer, mileometer, milometer |
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| oedometer | (noun) an instrument for measuring the rate and amount of consolidation of a soil specimen under pressure. | - |
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| ohmmeter | (noun) a meter for measuring electrical resistance in ohms | - |
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| optometrist | (noun) a person skilled in testing for defects of vision in order to prescribe corrective glasses | Synonyms: oculist |
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| optometry | (noun) the practice of an optometrist | - |
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| oximeter | (noun) a measuring instrument that measures the oxygen in arterial blood | - |
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| palmetto | (noun) any of several low-growing palms with fan-shaped leaves | - |
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| palometa | (noun) smaller than Florida pompano; common in West Indies | Synonyms: California pompano, Palometa simillima |
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| parameter | (noun) a constant in the equation of a curve that can be varied to yield a family of similar curves | Synonyms: parametric quantity |
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| (noun) a quantity (such as the mean or variance) that characterizes a statistical population and that can be estimated by calculations from sample data | - |
| (noun) (computer science) a reference or value that is passed to a function, procedure, subroutine, command, or program | Synonyms: argument |
| (noun) any factor that defines a system and determines (or limits) its performance | - |
| parametritis | (noun) inflammation of connective tissue adjacent to the uterus | - |
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| pedometer | (noun) measuring instrument for recording the number of steps taken in walking | - |
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| pelmet | (noun) a decorative framework to conceal curtain fixtures at the top of a window casing | Synonyms: cornice, valance, valance board |
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| pelvimeter | (noun) measuring instrument for performing pelvimetry | - |
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| pelvimetry | (noun) measurement of the dimensions of the bony birth canal (to determine whether vaginal birth is possible) | - |
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| pentameter | (noun) a verse line having five metrical feet | - |
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| pentamethylenetetrazol | (noun) a drug used as a circulatory and respiratory stimulant; larger doses cause convulsions in shock therapy; Metrazol is a trademark | Synonyms: Metrazol, pentylenetetrazol |
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| perchloromethane | (noun) a colorless nonflammable liquid used as a solvent for fats and oils; because of its toxicity its use as a cleaning fluid or fire extinguisher has declined | Synonyms: carbon tet, carbon tetrachloride, tetrachloromethane |
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| perimeter | (noun) the size of something as given by the distance around it | Synonyms: circumference |
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| (noun) the boundary line or the area immediately inside the boundary | Synonyms: border, margin |
| (noun) a line enclosing a plane areas | - |
| photometer | (noun) photographic equipment that measures the intensity of light | Synonyms: exposure meter, light meter |
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| (noun) measuring instrument for measuring the luminous intensity of a source by comparing it (visually or photoelectrically) with a standard source | - |
| photometrician | (noun) someone who practices photometry | Synonyms: photometrist |
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| photometrist | (noun) someone who practices photometry | Synonyms: photometrician |
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| photometry | (noun) measurement of the properties of light (especially luminous intensity) | - |
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| picometer | (noun) a metric unit of length equal to one trillionth of a meter | Synonyms: micromicron, picometre |
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| picometre | (noun) a metric unit of length equal to one trillionth of a meter | Synonyms: micromicron, picometer |
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| piezometer | (noun) a measuring instrument for measuring high pressures | - |
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| planimeter | (noun) a measuring instrument for measuring the area of an irregular plane figure | Synonyms: integrator |
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| plessimeter | (noun) a small thin metal plate held against the body and struck with a plexor in percussive examinations | Synonyms: pleximeter |
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| 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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| pleximetry | (noun) tapping a part of the body for diagnostic purposes | Synonyms: percussion |
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| plummet | (noun) the metal bob of a plumb line | Synonyms: plumb, plumb bob |
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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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| polymetry | (noun) The combining of different metres simultaneously. | - |
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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 | - |
| promethazine | (noun) antihistamine (trade name Phenergan) used to treat allergies; also an antiemetic used to treat motion sickness | Synonyms: Phenergan |
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| promethium | (noun) a soft silvery metallic element of the rare earth group having no stable isotope; was discovered in radioactive form as a fission product of uranium | Synonyms: atomic number 61, Pm |
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| psychometrics | (noun) any branch of psychology concerned with psychological measurements | Synonyms: psychometrika, psychometry |
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| psychometrika | (noun) any branch of psychology concerned with psychological measurements | Synonyms: psychometrics, psychometry |
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| psychometry | (noun) any branch of psychology concerned with psychological measurements | Synonyms: psychometrics, psychometrika |
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| 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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| pycnometry | (noun) The determination of liquid density by weighing the liquid in a container (pycnometer) of known volume. | - |
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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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| roomette | (noun) a small private compartment for one on a sleeping car | - |
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| salinometer | (noun) a hydrometer that determines the concentration of salt solutions by measuring their density | - |
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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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| 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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| sociometry | (noun) the quantitative study of social relationships | - |
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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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| spectrometry | (noun) the use of spectroscopes to analyze spectra | Synonyms: spectrographic analysis, spectroscopic analysis, spectroscopy, spectrum analysis |
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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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| spirometry | (noun) the use of a spirometer to measure vital capacity | - |
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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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| stoichiometry | (noun) (chemistry) the relation between the quantities of substances that take part in a reaction or form a compound (typically a ratio of whole integers) | - |
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| sulfamethazine | (noun) a sulfa drug used like sulfadiazine and also in veterinary medicine | Synonyms: sulfamezathine |
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| sulfamethoxazole | (noun) a sulfonamide (trade name Gantanol) used to treat infections (especially infections of the urinary tract) | Synonyms: Gantanol |
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| supersymmetry | (noun) (physics) a theory that tries to link the four fundamental forces | - |
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| symmetricalness | (noun) (mathematics) an attribute of a shape or relation; exact reflection of form on opposite sides of a dividing line or plane | Synonyms: balance, correspondence, symmetry |
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| symmetry | (noun) (mathematics) an attribute of a shape or relation; exact reflection of form on opposite sides of a dividing line or plane | Synonyms: balance, correspondence, symmetricalness |
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| (noun) (physics) the property of being isotropic; having the same value when measured in different directions | Synonyms: isotropy |
| (noun) balance among the parts of something | Synonyms: proportion |
| 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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| telemeter | (noun) any scientific instrument for observing events at a distance and transmitting the information back to the observer | - |
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| telemetry | (noun) automatic transmission and measurement of data from remote sources by wire or radio or other means | - |
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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 | - |
| tetrachloromethane | (noun) a colorless nonflammable liquid used as a solvent for fats and oils; because of its toxicity its use as a cleaning fluid or fire extinguisher has declined | Synonyms: carbon tet, carbon tetrachloride, perchloromethane |
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| tetrameter | (noun) a verse line having four metrical feet | - |
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| tetramethyldiarsine | (noun) a poisonous oily liquid with a garlicky odor composed of 2 cacodyl groups; undergoes spontaneous combustion in dry air | Synonyms: cacodyl |
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