| anoxemia | (noun) abnormally low oxygen content in arterial blood | - |
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| anoxia | (noun) severe hypoxia; absence of oxygen in inspired gases or in arterial blood or in the tissues | - |
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| equinox | (noun) (astronomy) either of the two celestial points at which the celestial equator intersects the ecliptic | Synonyms: equinoctial point |
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| (noun) either of two times of the year when the sun crosses the plane of the earth's equator and day and night are of equal length | - |
| minoxidil | (noun) a vasodilator (trade name Loniten) used to treat severe hypertension; one side effect is hirsutism so it is also sold (trade name Rogaine) as a treatment for male-patterned baldness | Synonyms: Loniten, Rogaine |
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| monoxide | (noun) an oxide containing just one atom of oxygen in the molecule | - |
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| noxiousness | (noun) the quality of being noxious | Synonyms: harmfulness, noisomeness |
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| obnoxiousness | (noun) the quality of being hateful | Synonyms: hatefulness, objectionableness |
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