| 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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| flamethrower | (noun) a weapon that squirts ignited fuel for several yards | - |
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| fluxmeter | (noun) meter that measures magnetic flux by the current it generates in a coil | - |
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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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| gametangium | (noun) cell or organ in which gametes develop | - |
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| gamete | (noun) a mature sexual reproductive cell having a single set of unpaired chromosomes | - |
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| gametocyte | (noun) an immature animal or plant cell that develops into a gamete by meiosis | - |
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| gametoecium | (noun) gametangia and surrounding bracts | - |
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| gametogenesis | (noun) the development and maturation of sex cells through meiosis | - |
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| gametophore | (noun) a modified branch bearing gametangia as in the thalloid liverworts | - |
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| gametophyte | (noun) the gamete-bearing individual or phase in the life cycle of a plant having alternation of generations | - |
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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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| 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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| gourmet | (noun) a person devoted to refined sensuous enjoyment (especially good food and drink) | Synonyms: bon vivant, epicure, epicurean, foodie, gastronome |
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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 |
| gravimetry | (noun) the measurement of specific gravity | Synonyms: hydrometry |
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| grommet | (noun) fastener consisting of a metal ring for lining a small hole to permit the attachment of cords or lines | Synonyms: cringle, eyelet, grummet, loop |
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| grummet | (noun) fastener consisting of a metal ring for lining a small hole to permit the attachment of cords or lines | Synonyms: cringle, eyelet, grommet, loop |
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| gunmetal | (noun) a type of bronze used for parts subject to wear or corrosion (especially corrosion by sea water) | - |
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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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| helmet | (noun) a protective headgear made of hard material to resist blows | - |
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| (noun) armor plate that protects the head | - |
| helmetflower | (noun) a herbaceous plant of the genus Scutellaria which has a calyx that, when inverted, resembles a helmet with its visor raised | Synonyms: skullcap |
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| (noun) a poisonous herb native to northern Europe having hooded blue-purple flowers; the dried leaves and roots yield aconite | Synonyms: Aconitum napellus, helmet flower, monkshood |
| (noun) any of several orchids of the genus Coryanthes having racemes of a few musky-scented waxy flowers with a helmet-shaped lip process | Synonyms: helmet orchid |
| hematocolpometra | (noun) accumulation of blood in the vagina and uterus | Synonyms: haematocolpometra |
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| hemimetabolism | (noun) incomplete or partial metamorphosis in insects | Synonyms: hemimetaboly, hemimetamorphosis |
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| hemimetaboly | (noun) incomplete or partial metamorphosis in insects | Synonyms: hemimetabolism, hemimetamorphosis |
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| hemimetamorphosis | (noun) incomplete or partial metamorphosis in insects | Synonyms: hemimetabolism, hemimetaboly |
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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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| 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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| 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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| hydroflumethiazide | (noun) diuretic used to treat hypertension and edema | - |
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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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| hydroxymethyl | (noun) a methyl with hydroxide replacing the hydrogen atoms | - |
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| hygrometer | (noun) measuring instrument for measuring the relative humidity of the atmosphere | - |
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| hypermetropia | (noun) abnormal condition in which vision for distant objects is better than for near objects | Synonyms: farsightedness, hypermetropy, hyperopia, longsightedness |
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| hypermetropy | (noun) abnormal condition in which vision for distant objects is better than for near objects | Synonyms: farsightedness, hypermetropia, hyperopia, longsightedness |
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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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| isogamete | (noun) either of a pair of conjugating gametes of the same size and structure | - |
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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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| kismet | (noun) (Islam) the will of Allah | Synonyms: kismat |
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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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| megagametophyte | (noun) the female gametophyte produced by the megaspore of a plant that produces both microspore and megaspores | - |
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| memetics | (noun) a theory of mental content based on an analogy with Darwinian evolution. | - |
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| metabola | (noun) insects that undergo complete metamorphosis | Synonyms: holometabola |
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| metabolism | (noun) the organic processes (in a cell or organism) that are necessary for life | Synonyms: metabolic process |
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| (noun) the marked and rapid transformation of a larva into an adult that occurs in some animals | Synonyms: metamorphosis |
| metabolite | (noun) any substance involved in metabolism (either as a product of metabolism or as necessary for metabolism) | - |
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| metacarpal | (noun) any bone of the hand between the wrist and fingers | Synonyms: metacarpal bone |
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| metacarpus | (noun) the part of the hand between the carpus and phalanges | - |
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| metacenter | (noun) (shipbuilding) the point of intersection between two vertical lines, one line through the center of buoyancy of the hull of a ship in equilibrium and the other line through the center of buoyancy of the hull when the ship is inclined to one side; the distance of this intersection above the center of gravity is an indication of the stability of the ship | Synonyms: metacentre |
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| metacentre | (noun) (shipbuilding) the point of intersection between two vertical lines, one line through the center of buoyancy of the hull of a ship in equilibrium and the other line through the center of buoyancy of the hull when the ship is inclined to one side; the distance of this intersection above the center of gravity is an indication of the stability of the ship | Synonyms: metacenter |
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| metacyesis | (noun) pregnancy resulting from gestation elsewhere than in the uterus | Synonyms: eccyesis, ectopic gestation, ectopic pregnancy, extrauterine gestation, extrauterine pregnancy |
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| metadata | (noun) data about data | - |
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| metagenesis | (noun) alternation of sexual and asexual generations | Synonyms: digenesis |
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| metaknowledge | (noun) knowledge about knowledge | - |
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| metal | (noun) any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc. | Synonyms: metallic element |
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| (noun) a mixture containing two or more metallic elements or metallic and nonmetallic elements usually fused together or dissolving into each other when molten | Synonyms: alloy |
| metalanguage | (noun) a language that can be used to describe languages | - |
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| metalepsis | (noun) substituting metonymy of one figurative sense for another | - |
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| metalhead | (noun) a fan of heavy metal music | - |
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| metallic | (noun) a yarn made partly or entirely of metal | - |
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| (noun) a fabric made of a yarn that is partly or entirely of metal | - |
| metallicity | (noun) The state of possessing a similar aural resonance to metal. | - |
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| metallurgist | (noun) an engineer trained in the extraction and refining and alloying and fabrication of metals | Synonyms: metallurgical engineer |
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| metallurgy | (noun) the science and technology of metals | - |
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| metalware | (noun) household articles made of metal (especially for use at table) | - |
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| metalwork | (noun) the activity of making things out of metal in a skillful manner | Synonyms: metalworking |
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| (noun) the metal parts of something | - |
| metalworker | (noun) someone who works metal (especially by hammering it when it is hot and malleable) | Synonyms: smith |
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