01 n. That point of the heavens, or lower hemisphere, directly opposite the zenith; the inferior pole of the horizon; the point of the celestial …
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1.
That point of the heavens, or lower hemisphere, directly opposite the zenith; the inferior pole of the horizon; the point of the celestial sphere directly under the place where we stand.
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2.
The lowest point; the time of greatest depression.“The seventh century is the nadir of the human mind in Europe.” — Hallam.
Phrases & compounds
Nadir of the sun —
the axis of the conical shadow projected by the earth.