| hydromel | (noun) honey diluted in water; becomes mead when fermented | - |
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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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| hydrometric | (adjective) of or relating to hydrometry | Synonyms: gravimetric |
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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 |
| income | (noun) the financial gain (earned or unearned) accruing over a given period of time | - |
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| indomethacin | (noun) a nonsteroidal anti-inflammatory drug (trade name Indocin) | Synonyms: Indocin |
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| infomercial | (noun) a television commercial presented in the form of a short documentary | Synonyms: informercial |
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| interferometer | (noun) any measuring instrument that uses interference patterns to make accurate measurements of waves | - |
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| irksome | (adjective) so lacking in interest as to cause mental weariness | Synonyms: boring, deadening, dull, ho-hum, slow, tedious, tiresome, wearisome |
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| isomer | (noun) a compound that exists in forms having different arrangements of atoms but the same molecular weight | - |
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| isomerase | (noun) an enzyme that catalyzes its substrate to an isomeric form | - |
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| isomeric | (adjective) of or relating to or exhibiting isomerism | - |
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| isomerisation | (noun) the conversion of a compound into an isomer of itself | Synonyms: isomerization |
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| isomerise | (verb) change into an isomer | Synonyms: isomerize |
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| (verb) cause to change into an isomer | Synonyms: isomerize |
| isomerism | (noun) the state of being an isomer; the complex of chemical and physical phenomena characteristic of isomers | - |
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| isomerization | (noun) the conversion of a compound into an isomer of itself | Synonyms: isomerisation |
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| isomerize | (verb) change into an isomer | Synonyms: isomerise |
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| (verb) cause to change into an isomer | Synonyms: isomerise |
| isometric | (adjective) of or involving muscular contraction in which tension increases while length remains constant | - |
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| (adjective) related by an isometry | - |
| (adjective) of a crystal system characterized by three equal axes at right angles | - |
| (adjective) having equal dimensions or measurements | Synonyms: isometrical |
| (noun) a line connecting isometric points | Synonyms: isometric line |
| isometrical | (adjective) having equal dimensions or measurements | Synonyms: isometric |
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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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| latecomer | (noun) someone who arrives late | - |
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| lepidomelane | (noun) a mica that is a biotite containing iron | - |
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| leptomeninges | (noun) the two innermost layers of the meninges; cerebrospinal fluid circulates between these innermost layers | - |
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| leptomeningitis | (noun) inflammation of the leptomeninges | - |
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| lightsome | (adjective) carefree and happy and lighthearted | Synonyms: blithe, blithesome, light-hearted, lighthearted |
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| (adjective) moving easily and quickly; nimble | Synonyms: light, tripping |
| lightsomely | (adverb) in a light-hearted manner | Synonyms: light-heartedly |
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| (adverb) moving with quick light steps | Synonyms: trippingly |
| lightsomeness | (noun) the trait of being lighthearted and frivolous | Synonyms: lightness |
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| (noun) the gracefulness of a person or animal that is quick and nimble | Synonyms: agility, legerity, lightness, nimbleness |
| (noun) the cheerful feeling you have when nothing is troubling you | Synonyms: carefreeness, insouciance, lightheartedness |
| liposome | (noun) an artificially made microscopic vesicle into which nucleic acids can be packaged; used in molecular biology as a transducing vector | - |
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| lissome | (adjective) gracefully thin and bending and moving with ease | Synonyms: lissom, lithe, lithesome, sinuous, supple |
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| lissomeness | (noun) the gracefulness of a person or animal that is flexible and supple | Synonyms: litheness, suppleness |
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| lithesome | (adjective) gracefully thin and bending and moving with ease | Synonyms: lissom, lissome, lithe, sinuous, supple |
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| loathsome | (adjective) highly offensive; arousing aversion or disgust | Synonyms: disgustful, disgusting, distasteful, foul, loathly, repellant, repellent, repelling, revolting, skanky, wicked, yucky |
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| (adjective) causing or able to cause nausea | Synonyms: nauseating, nauseous, noisome, offensive, queasy, sickening, vile |
| loathsomeness | (noun) the quality of being disgusting to the senses or emotions | Synonyms: lousiness, repulsiveness, sliminess, vileness, wickedness |
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| loment | (noun) seedpods that are constricted between the seeds and that break apart when mature into single-seeded segments | - |
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| lonesome | (adjective) marked by dejection from being alone | Synonyms: lonely |
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| (adjective) being the only one; single and isolated from others | Synonyms: lone, only, sole, solitary |
| lonesomeness | (noun) a disposition toward being alone | Synonyms: aloneness, loneliness, solitariness |
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| lovesome | (adjective) having or displaying warmth or affection | Synonyms: affectionate, fond, tender |
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| loxodrome | (noun) a line on a sphere that cuts all meridians at the same angle; the path taken by a ship or plane that maintains a constant compass direction | Synonyms: rhumb, rhumb line |
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| lysosome | (noun) an organelle found in the cytoplasm of most cells (especially in leukocytes and liver and kidney cells) | - |
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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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| meddlesome | (adjective) intrusive in a meddling or offensive manner | Synonyms: busy, busybodied, interfering, meddling, officious |
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| meddlesomeness | (noun) aggressiveness as evidenced by intruding; by advancing yourself or your ideas without invitation | Synonyms: intrusiveness, officiousness |
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| meromelia | (noun) congenital absence of part of an arm or leg | - |
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| metronome | (noun) clicking pendulum indicates the exact tempo of a piece of music | - |
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| mettlesome | (adjective) willing to face danger | Synonyms: game, gamey, gamy, gritty, spirited, spunky |
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| (adjective) having a proud and unbroken spirit | - |
| mettlesomeness | (noun) courageous high-spiritedness | - |
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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 |
| 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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| microsome | (noun) a tiny granule in the cytoplasm that is where protein synthesis takes place under the direction of mRNA | - |
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| microtome | (noun) scientific instrument that cuts thin slices of something for microscopic examination | - |
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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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| misnomer | (noun) an incorrect or unsuitable name | - |
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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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| moment | (noun) having important effects or influence | Synonyms: consequence, import |
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| (noun) the n-th moment of a distribution is the expected value of the n-th power of the deviations from a fixed value | - |
| (noun) a turning force produced by an object acting at a distance (or a measure of that force) | - |
| (noun) a particular point in time | Synonyms: instant, minute, second |
| (noun) an indefinitely short time | Synonyms: bit, minute, mo, second |
| (noun) at this time | Synonyms: here and now, present moment |
| momentaneous | (adjective) lasting for a markedly brief time | Synonyms: fleeting, fugitive, momentary |
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| momentarily | (adverb) at any moment | Synonyms: momently |
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| (adverb) for an instant or moment | Synonyms: momently |
| momentary | (adjective) lasting for a markedly brief time | Synonyms: fleeting, fugitive, momentaneous |
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| momently | (adverb) at any moment | Synonyms: momentarily |
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| (adverb) for an instant or moment | Synonyms: momentarily |
| momentous | (adjective) of very great significance | - |
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| momentously | (adverb) in a momentous way | - |
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| momentousness | (noun) utmost importance | - |
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| momentum | (noun) an impelling force or strength | Synonyms: impulse |
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| (noun) the product of a body's mass and its velocity | - |
| monochrome | (adjective) having or appearing to have only one color | Synonyms: monochromatic, monochromic, monochromous |
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| (noun) a black-and-white photograph or slide | Synonyms: black and white |
| (noun) painting done in a range of tones of a single color | - |
| monomer | (noun) a simple compound whose molecules can join together to form polymers | - |
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| monometallic | (adjective) containing one atom of metal in the molecule | - |
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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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| myelomeningocele | (noun) a congenital defect of the central nervous system in which a sac containing part of the spinal cord and its meninges protrude through a gap in the vertebral column; frequently accompanied by hydrocephalus and mental retardation | - |
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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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| 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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| nettlesome | (adjective) causing irritation or annoyance | Synonyms: annoying, bothersome, galling, irritating, pesky, pestering, pestiferous, plaguey, plaguy, teasing, vexatious, vexing |
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| (adjective) easily irritated or annoyed | Synonyms: cranky, fractious, irritable, peckish, peevish, pettish, petulant, scratchy, techy, testy, tetchy |
| newcomer | (noun) any new participant in some activity | Synonyms: entrant, fledgeling, fledgling, freshman, neophyte, newbie, starter |
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| (noun) a recent arrival | - |
| nitrochloromethane | (noun) gaseous form of chloropicrin used as tear gas | - |
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| noisome | (adjective) offensively malodorous | Synonyms: fetid, foetid, foul-smelling, foul, funky, ill-scented, smelly, stinking |
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| (adjective) causing or able to cause nausea | Synonyms: loathsome, nauseating, nauseous, offensive, queasy, sickening, vile |
| noisomeness | (noun) the quality of being noxious | Synonyms: harmfulness, noxiousness |
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| nomenclature | (noun) a system of words used to name things in a particular discipline | Synonyms: language, terminology |
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| nomenklatura | (noun) the system of patronage in communist countries; controlled by committees in the Communist Party | - |
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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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| oenomel | (noun) wine mixed with honey | - |
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