Etymology
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nadir (n.)

late 14c., in astronomy, "imaginary point of the celestial sphere vertically opposite to the zenith of the sun; the inferior pole of the horizon," from Medieval Latin nadir, from Arabic nazir "opposite to," in nazir as-samt, literally "opposite direction," from nazir "opposite" + as-samt "road, path" (see zenith). Transferred sense of "lowest point" of anything is recorded by 1793.

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Definitions of nadir

nadir (n.)
an extreme state of adversity; the lowest point of anything;
Synonyms: low-water mark
nadir (n.)
the point below the observer that is directly opposite the zenith on the imaginary sphere against which celestial bodies appear to be projected;
From wordnet.princeton.edu

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