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Answer: microbe : microscope :: spectrum : spectrometer

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Spectrometer definition, an optical device for measuring wavelengths, deviation of refracted rays, and angles between faces of a prism, especially an instrument (prism spectrometer) consisting of a slit through which light passes, a collimator, a prism that deviates the light, and a telescope through which the deviated light is viewed and examined.

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Spectrum definition at Dictionary.com, a free online dictionary with pronunciation, synonyms and translation. Look it up now!

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Astrophysics definition, the branch of astronomy that deals with the physical properties of celestial bodies and with the interaction between matter and radiation in the interior of celestial bodies and in interstellar space. See more.

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Astronomy definition, the science that deals with the material universe beyond the earth's atmosphere. See more.

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Chloroplast definition, a plastid containing chlorophyll. See more.

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Cyanophyta definition, a phylum, or subkingdom, in the kingdom Monera, comprising the blue-green algae. See more.

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Telescope definition, an optical instrument for making distant objects appear larger and therefore nearer.

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Astronomer definition, an expert in astronomy; a scientific observer of the celestial bodies. See more.

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Microscope definition, an optical instrument having a magnifying lens or a combination of lenses for inspecting objects too small to be seen or too small to be seen distinctly and in detail by the unaided eye. See more.

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Microbe definition, a microorganism, especially a pathogenic bacterium. See more.

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Bonanza definition, a rich mass of ore, as found in mining. See more.

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Bonus definition, something given or paid over and above what is due. See more.

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Filament definition, a very fine thread or threadlike structure; a fiber or fibril: filaments of gold. See more.

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Filigree definition, delicate ornamental work of fine silver, gold, or other metal wires, especially lacy jewelers' work of scrolls and arabesques. See more.

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Toxic definition, of, pertaining to, affected with, or caused by a toxin or poison: a toxic condition. See more.

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Nontoxic definition, of, pertaining to, affected with, or caused by a toxin or poison: a toxic condition. See more.

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Dysentery definition, an infectious disease marked by inflammation and ulceration of the lower part of the bowels, with diarrhea that becomes mucous and hemorrhagic. See more.

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Enteritis definition, inflammation of the intestines, especially the small intestine. See more.

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Answer: aerobic : anaerobic :: nontoxic : toxic

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Aerobic definition, (of an organism or tissue) requiring the presence of air or free oxygen for life. See more.

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Anaerobic definition, (of an organism or tissue) living in the absence of air or free oxygen. See more.