nadir

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na·dir / ˈnādər; ˈnādi(ə)r/ • n. [in sing.] the lowest point in the fortunes of a person or organization: they had reached the nadir of their sufferings. ∎  Astron. the point on the celestial sphere directly below an observer. The opposite of zenith.

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nadir the point on the celestial sphere directly below an observer; in general use, the lowest point in the fortunes of a person or organization. Recorded from late Middle English (in the astronomical sense) the word comes via French from Arabic naẓīr (as-samt) ‘opposite (to the zenith)’.

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nadir (nā´dər) [Arab.,=opposite], in astronomy, the point on the celestial sphere directly opposite the zenith, i.e., directly beneath the observer.

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nadir (astron.) †point in the heavens diametrically opposite to another XIV; point opposite to the zenith XV; lowest point XVIII. — (O)F. — Arab. naz̳īr opposite. In the second sense for naz̳īr as-samt opposite to the ZENITH.

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nadir Point on the celestial sphere vertically below the observer. It is diametrically opposite the zenith.

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nadir In remote sensing, the point on the ground directly beneath a remote sensing system.