| accelerometer | (noun) an instrument for measuring the acceleration of aircraft or rockets | - |
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| actinometer | (noun) an instrument for measuring the intensity of electromagnetic radiation (usually by the photochemical effect) | - |
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| actinometry | (noun) measuring the intensity of electromagnetic radiation (especially of the sun's rays) | - |
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| algometer | (noun) device for measuring pain caused by pressure | - |
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| algometry | (noun) measuring sensitivity to pain or pressure | - |
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| allometry | (noun) the study of the relative growth of a part of an organism in relation to the growth of the whole | - |
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| aminomethane | (noun) a methyl with the hydrogen atom replaced by an amino radical | - |
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| anemoclinometer | (noun) A type of instrument which measures the inclination of the wind to the horizontal plane. | - |
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| anemometer | (noun) a gauge for recording the speed and direction of wind | Synonyms: wind gage, wind gauge |
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| anemometry | (noun) measuring wind speed and direction | - |
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| anisometropia | (noun) difference in the refractive power of the two eyes | - |
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| anthropometry | (noun) measurement and study of the human body and its parts and capacities | - |
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| astrometry | (noun) the branch of astronomy that deals with the measurement of the position and motion of celestial bodies | - |
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| atmometer | (noun) an instrument that measures rate of evaporation of water | Synonyms: evaporometer |
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| audiometer | (noun) an instrument used to measure the sensitivity of hearing | Synonyms: sonometer |
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| audiometry | (noun) measuring sensitivity of hearing | - |
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| (noun) the measurement of hearing | Synonyms: audiology |
| barometer | (noun) an instrument that measures atmospheric pressure | - |
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| bathometer | (noun) an instrument that measures the depth of water | Synonyms: bathymeter |
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| biometrics | (noun) a branch of biology that studies biological phenomena and observations by means of statistical analysis | Synonyms: biometry, biostatistics |
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| biometry | (noun) a branch of biology that studies biological phenomena and observations by means of statistical analysis | Synonyms: biometrics, biostatistics |
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| bolometer | (noun) an instrument that measures heat radiation; extremely sensitive | - |
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| cephalometry | (noun) measurement of human heads | - |
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| chronometer | (noun) an accurate clock (especially used in navigation) | - |
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| clinometer | (noun) an instrument used by surveyors in order to measure an angle of inclination or elevation | Synonyms: inclinometer |
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| comet | (noun) (astronomy) a relatively small extraterrestrial body consisting of a frozen mass that travels around the sun in a highly elliptical orbit | - |
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| craniometer | (noun) an instrument for measuring skull sizes | - |
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| craniometry | (noun) the branch of physical anthropology dealing with the study and measurement of dry skulls after removal of its soft parts | - |
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| cryometer | (noun) a thermometer designed to measure low temperatures | - |
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| cytophotometer | (noun) a photometer that can be used to locate and identify chemical compounds in a cell by measuring the intensity of the light that passes through stained sections of the cytoplasm | - |
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| cytophotometry | (noun) the study of chemical compounds inside a cell by means of a cytophotometer | - |
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| declinometer | (noun) an instrument for measuring magnetic declination | Synonyms: transit declinometer |
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| densitometer | (noun) a measuring instrument for determining optical or photographic density | - |
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| (noun) a measuring instrument for determining density or specific gravity | Synonyms: densimeter |
| densitometry | (noun) measuring the optical density of a substance by shining light on it and measuring its transmission | - |
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| dichloromethane | (noun) a nonflammable liquid used as a solvent and paint remover and refrigerant | Synonyms: methylene chloride |
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| durometer | (noun) An instrument for measuring the degree of hardness; especially, an instrument for testing the relative hardness of steel rails and the like. | - |
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| dynamometer | (noun) measuring instrument designed to measure power | Synonyms: ergometer |
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| econometrician | (noun) an economist who uses statistical and mathematical methods | Synonyms: econometrist |
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| econometrics | (noun) the application of mathematics and statistics to the study of economic and financial data | - |
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| econometrist | (noun) an economist who uses statistical and mathematical methods | Synonyms: econometrician |
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| electrodynamometer | (noun) measuring instrument that uses the interaction of the magnetic fields of two coils to measure current or voltage or power | - |
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| electrometer | (noun) meter to measure electrostatic voltage differences; draws no current from the source | - |
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| endometriosis | (noun) the presence of endometrium elsewhere than in the lining of the uterus; causes premenstrual pain and dysmenorrhea | Synonyms: adenomyosis |
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| endometritis | (noun) inflammation of the lining of the uterus (of the endometrium) | Synonyms: metritis |
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| endometrium | (noun) (pregnancy) the mucous membrane that lines the uterus; thickens under hormonal control and (if pregnancy does not occur) is shed in menstruation; if pregnancy occurs it is shed along with the placenta at parturition | - |
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| ergometer | (noun) measuring instrument designed to measure power | Synonyms: dynamometer |
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| eriometer | (noun) An instrument for measuring the diameters of minute particles or fibers, from the size of the colored rings produced by the diffraction of the light in which the objects are viewed. | - |
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| eudiometer | (noun) measuring instrument consisting of a graduated glass tube for measuring volume changes in chemical reactions between gases | - |
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| evaporometer | (noun) an instrument that measures rate of evaporation of water | Synonyms: atmometer |
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| fathometer | (noun) depth finder for determining depth of water or a submerged object by means of ultrasound waves | Synonyms: sonic depth finder |
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| femtometer | (noun) a metric unit of length equal to one quadrillionth of a meter | Synonyms: femtometre, fermi |
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| femtometre | (noun) a metric unit of length equal to one quadrillionth of a meter | Synonyms: femtometer, fermi |
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| fetometry | (noun) measurement of a fetus (especially the diameter of the head) | Synonyms: foetometry |
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| foetometry | (noun) measurement of a fetus (especially the diameter of the head) | Synonyms: fetometry |
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| galvanometer | (noun) meter for detecting or comparing or measuring small electric currents | - |
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| gasometer | (noun) a large gas-tight spherical or cylindrical tank for holding gas to be used as fuel | Synonyms: gas holder |
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| (noun) a meter for measuring the amount of gas flowing through a particular pipe | Synonyms: gas meter |
| geometer | (noun) a mathematician specializing in geometry | Synonyms: geometrician |
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| geometrician | (noun) a mathematician specializing in geometry | Synonyms: geometer |
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| geometrid | (noun) slender-bodied broad-winged moth whose larvae are called measuring worms | Synonyms: geometrid moth |
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| geometry | (noun) the pure mathematics of points and lines and curves and surfaces | - |
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| goniometer | (noun) direction finder that determines the angular direction of incoming radio signals | - |
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| haematocolpometra | (noun) accumulation of blood in the vagina and uterus | Synonyms: hematocolpometra |
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| hectometer | (noun) a metric unit of length equal to 100 meters | Synonyms: hectometre, hm |
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| hectometre | (noun) a metric unit of length equal to 100 meters | Synonyms: hectometer, hm |
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| heliometer | (noun) an instrument used to measure the angular separation of two stars that are too far apart to be included in the field of view of an ordinary telescope | - |
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| hematocolpometra | (noun) accumulation of blood in the vagina and uterus | Synonyms: haematocolpometra |
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| heterometabolism | (noun) development of insects with incomplete metamorphosis in which no pupal stage precedes maturity | Synonyms: heterometaboly |
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| heterometaboly | (noun) development of insects with incomplete metamorphosis in which no pupal stage precedes maturity | Synonyms: heterometabolism |
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| hodometer | (noun) a meter that shows mileage traversed | Synonyms: mileometer, milometer, odometer |
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| holometabola | (noun) insects that undergo complete metamorphosis | Synonyms: metabola |
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| holometabolism | (noun) complete metamorphosis in insects | Synonyms: holometaboly |
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| holometaboly | (noun) complete metamorphosis in insects | Synonyms: holometabolism |
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| hometown | (noun) the town (or city) where you grew up or where you have your principal residence | - |
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| hydrometer | (noun) a measuring instrument for determining the specific gravity of a liquid or solid | Synonyms: gravimeter |
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| hydrometry | (noun) the measurement of specific gravity | Synonyms: gravimetry |
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| hygrometer | (noun) measuring instrument for measuring the relative humidity of the atmosphere | - |
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| hypsometer | (noun) an altimeter that uses the boiling point of water to determine land elevation | - |
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| hypsometry | (noun) measurement of the elevation of land above sea level | Synonyms: hypsography |
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| inclinometer | (noun) a measuring instrument for measuring the angle of magnetic dip (as from an airplane) | Synonyms: dip circle |
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| (noun) an instrument showing the angle that an aircraft makes with the horizon | - |
| (noun) an instrument used by surveyors in order to measure an angle of inclination or elevation | Synonyms: clinometer |
| indomethacin | (noun) a nonsteroidal anti-inflammatory drug (trade name Indocin) | Synonyms: Indocin |
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| interferometer | (noun) any measuring instrument that uses interference patterns to make accurate measurements of waves | - |
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| isometric | (noun) a line connecting isometric points | Synonyms: isometric line |
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| isometrics | (noun) muscle-building exercises (or a system of musclebuilding exercises) involving muscular contractions against resistance without movement (the muscles contracts but the length of the muscle does not change) | Synonyms: isometric exercise |
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| isometropia | (noun) equality of refractive power in the two eyes | - |
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| isometry | (noun) equality of measure (e.g., equality of height above sea level or equality of loudness etc.) | - |
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| (noun) equality of elevation above sea level | - |
| (noun) a one-to-one mapping of one metric space into another metric space that preserves the distances between each pair of points | - |
| (noun) the growth rates in different parts of a growing organism are the same | - |
| katharometer | (noun) measures thermal conductivity | - |
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| kilometer | (noun) a metric unit of length equal to 1000 meters (or 0.621371 miles) | Synonyms: kilometre, klick, km |
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| kilometrage | (noun) the number of kilometres travelled by a vehicle. | - |
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| kilometre | (noun) a metric unit of length equal to 1000 meters (or 0.621371 miles) | Synonyms: kilometer, klick, km |
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| magnetometer | (noun) a meter to compare strengths of magnetic fields | Synonyms: gaussmeter |
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| manometer | (noun) a pressure gauge for comparing pressures of a gas | - |
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| micrometeor | (noun) a meteorite or meteoroid so small that it drifts down to earth without becoming intensely heated in the atmosphere | Synonyms: micrometeorite, micrometeoroid |
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| micrometeorite | (noun) a meteorite or meteoroid so small that it drifts down to earth without becoming intensely heated in the atmosphere | Synonyms: micrometeor, micrometeoroid |
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| micrometeoroid | (noun) a meteorite or meteoroid so small that it drifts down to earth without becoming intensely heated in the atmosphere | Synonyms: micrometeor, micrometeorite |
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| micrometer | (noun) a metric unit of length equal to one millionth of a meter | Synonyms: micrometre, micron |
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| (noun) caliper for measuring small distances | Synonyms: micrometer caliper, micrometer gauge |
| micrometre | (noun) a metric unit of length equal to one millionth of a meter | Synonyms: micrometer, micron |
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| micrometry | (noun) measuring with a micrometer | - |
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| microphotometer | (noun) special kind of densitometer that measures density variations over a very small area | - |
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| mileometer | (noun) a meter that shows mileage traversed | Synonyms: hodometer, milometer, odometer |
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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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