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nacre
nacreous
nacreous cloud
NACRO
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NADH
nadi
nadir
NADP
NADPH
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nadir

na·dir [ náydər, náy dr ] (plural na·dirs)


noun 
Definition:
 
1. lowest point: the lowest possible point
the nadir of despair

2. point on celestial sphere: the point on the celestial sphere directly below the observer and opposite the zenith

[14th century. Via French and medieval Latin< Arabic naẓîr (as-samt) "opposite (the zenith)"]
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