| kinetochore | (noun) a specialized condensed region of each chromosome that appears during mitosis where the chromatids are held together to form an X shape | Synonyms: centromere |
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| kinetosis | (noun) the state of being dizzy or nauseated because of the motions that occur while traveling in or on a moving vehicle | Synonyms: motion sickness |
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| magneto | (noun) a small dynamo with a secondary winding that produces a high voltage enabling a spark to jump between the poles of a spark plug in a gasoline engine | Synonyms: magnetoelectric machine |
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| magnetograph | (noun) a scientific instrument that registers magnetic variations (especially variations of the earth's magnetic field) | - |
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| magnetohydrodynamics | (noun) the study of the interaction of magnetic fields and electrically conducting fluids (as plasma or molten metal) | - |
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| magnetometer | (noun) a meter to compare strengths of magnetic fields | Synonyms: gaussmeter |
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| magneton | (noun) a unit of magnetic moment of a molecular or atomic or subatomic particle | - |
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| magnetosphere | (noun) the magnetic field of a planet; the volume around the planet in which charged particles are subject more to the planet's magnetic field than to the solar magnetic field | - |
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| planetoid | (noun) any of numerous small celestial bodies that move around the sun | Synonyms: minor planet |
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