| 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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| agamete | (noun) an asexual reproductive cell | - |
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| algometer | (noun) device for measuring pain caused by pressure | - |
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| altimeter | (noun) an instrument that measures the height above ground; used in navigation | - |
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| ammeter | (noun) a meter that measures the flow of electrical current in amperes | - |
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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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| anisogamete | (noun) either of a pair of unlike gametes especially those unlike in size | - |
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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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| 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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| bathymeter | (noun) an instrument that measures the depth of water | Synonyms: bathometer |
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| bolometer | (noun) an instrument that measures heat radiation; extremely sensitive | - |
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| calorimeter | (noun) a measuring instrument that determines quantities of heat | - |
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| cemetery | (noun) a tract of land used for burials | Synonyms: burial ground, burial site, burying ground, graveyard, memorial park, necropolis |
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| centimeter | (noun) a metric unit of length equal to one hundredth of a meter | Synonyms: centimetre, cm |
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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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| colorimeter | (noun) a measuring instrument used in colorimetric analysis to determine the quantity of a substance from the color it yields with specific reagents | Synonyms: tintometer |
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| craniometer | (noun) an instrument for measuring skull sizes | - |
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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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| dasymeter | (noun) densimeter consisting of a thin glass globe that is weighed in a gas to determine its density | - |
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| decameter | (noun) a metric unit of length equal to ten meters | Synonyms: dam, decametre, dekameter, dekametre, dkm |
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| decimeter | (noun) a metric unit of length equal to one tenth of a meter | Synonyms: decimetre, dm |
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| declinometer | (noun) an instrument for measuring magnetic declination | Synonyms: transit declinometer |
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| dekameter | (noun) a metric unit of length equal to ten meters | Synonyms: dam, decameter, decametre, dekametre, dkm |
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| densimeter | (noun) a measuring instrument for determining density or specific gravity | Synonyms: densitometer |
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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 |
| diameter | (noun) the length of a straight line passing through the center of a circle and connecting two points on the circumference | Synonyms: diam |
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| (noun) a straight line connecting the center of a circle with two points on its perimeter (or the center of a sphere with two points on its surface) | - |
| dosemeter | (noun) a measuring instrument for measuring doses of ionizing radiation (X-rays or radioactivity) | Synonyms: dosimeter |
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| dosimeter | (noun) a measuring instrument for measuring doses of ionizing radiation (X-rays or radioactivity) | Synonyms: dosemeter |
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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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| 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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| 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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| fluxmeter | (noun) meter that measures magnetic flux by the current it generates in a coil | - |
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| galvanometer | (noun) meter for detecting or comparing or measuring small electric currents | - |
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| gamete | (noun) a mature sexual reproductive cell having a single set of unpaired chromosomes | - |
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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 |
| gaussmeter | (noun) a meter to compare strengths of magnetic fields | Synonyms: magnetometer |
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| geometer | (noun) a mathematician specializing in geometry | Synonyms: geometrician |
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| goniometer | (noun) direction finder that determines the angular direction of incoming radio signals | - |
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| gravimeter | (noun) a measuring instrument for determining the specific gravity of a liquid or solid | Synonyms: hydrometer |
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| (noun) a measuring instrument for measuring variations in the gravitational field of the earth | Synonyms: gravity meter |
| hectometer | (noun) a metric unit of length equal to 100 meters | Synonyms: hectometre, 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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| helmeted | (adjective) equipped with or wearing a helmet | - |
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| hexameter | (noun) a verse line having six metrical feet | - |
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| hodometer | (noun) a meter that shows mileage traversed | Synonyms: mileometer, milometer, odometer |
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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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| 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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| 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 |
| interferometer | (noun) any measuring instrument that uses interference patterns to make accurate measurements of waves | - |
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| isogamete | (noun) either of a pair of conjugating gametes of the same size and structure | - |
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| 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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| konimeter | (noun) A konimeter is a device for measuring airborne dust concentration in which samples are obtained by sucking the air through a hole and allowing it to pass over a glass plate coated with grease on which the particles collect. | - |
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| limnimeter | (noun) a tide gage used for measuring lake level variations. | - |
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| machmeter | (noun) speedometer for measuring the speed of an aircraft relative to the speed of sound | - |
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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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| mete | (noun) a line that indicates a boundary | Synonyms: border, borderline, boundary line, delimitation |
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| metempsychosis | (noun) after death the soul begins a new cycle of existence in another human body | Synonyms: rebirth |
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| metencephalon | (noun) the part of the hindbrain that develops into the pons and the cerebellum | - |
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| meteor | (noun) (astronomy) any of the small solid extraterrestrial bodies that hits the earth's atmosphere | Synonyms: meteoroid |
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| (noun) a streak of light in the sky at night that results when a meteoroid hits the earth's atmosphere and air friction causes the meteoroid to melt or vaporize or explode | Synonyms: shooting star |
| meteoric | (adjective) pertaining to or consisting of meteors or meteoroids | - |
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| (adjective) of or pertaining to atmospheric phenomena, especially weather and weather conditions | Synonyms: meteorologic, meteorological |
| (adjective) like a meteor in speed or brilliance or transience | - |
| meteorite | (noun) stony or metallic object that is the remains of a meteoroid that has reached the earth's surface | - |
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| meteoritic | (adjective) of or relating to or caused by meteorites | Synonyms: meteoritical |
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| meteoritical | (adjective) of or relating to or caused by meteorites | Synonyms: meteoritic |
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| meteoroid | (noun) (astronomy) any of the small solid extraterrestrial bodies that hits the earth's atmosphere | Synonyms: meteor |
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| meteorologic | (adjective) of or pertaining to atmospheric phenomena, especially weather and weather conditions | Synonyms: meteoric, meteorological |
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| meteorological | (adjective) of or pertaining to atmospheric phenomena, especially weather and weather conditions | Synonyms: meteoric, meteorologic |
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| meteorologically | (adverb) with respect to the weather | - |
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| meteorologist | (noun) a specialist who studies processes in the earth's atmosphere that cause weather conditions | - |
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| meteorology | (noun) the earth science dealing with phenomena of the atmosphere (especially weather) | - |
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| (noun) predicting what the weather will be | Synonyms: weather forecasting |
| meteortropism | (noun) an effect of climate on biological processes (as the effect on joint pains etc.) | - |
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| meter | (noun) any of various measuring instruments for measuring a quantity | - |
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| (noun) rhythm as given by division into parts of equal duration | Synonyms: metre, time |
| (noun) (prosody) the accent in a metrical foot of verse | Synonyms: beat, cadence, measure, metre |
| (noun) the basic unit of length adopted under the Systeme International d'Unites (approximately 1.094 yards) | Synonyms: m, metre |
| (verb) measure with a meter | - |
| (verb) stamp with a meter indicating the postage | - |
| meterstick | (noun) a rule one meter long (usually marked off in centimeters and millimeters) | Synonyms: metrestick |
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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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| micrometeoric | (adjective) of or relating to micrometeoroids | Synonyms: micrometeoritic |
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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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| micrometeoritic | (adjective) of or relating to micrometeoroids | Synonyms: micrometeoric |
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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 |
| micromillimeter | (noun) a metric unit of length equal to one billionth of a meter | Synonyms: micromillimetre, millimicron, nanometer, nanometre, nm |
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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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| 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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| 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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