/
ˈneɪdɪə,
ˈnadɪə/
n.
- the lowest or most unsuccessful point:
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his fortunes reached their nadir.
- Astronomy the point on the celestial sphere directly below an observer. The opposite of zenith.
Etymology
ME: via Fr. from Arab. naẓīr (as-samt) ‘opposite (to the zenith)’.
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