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Definition of nadir


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na·dir  audio  (ndr, -dîr) KEY  

NOUN:
  1. Astronomy A point on the celestial sphere directly below the observer, diametrically opposite the zenith.
  2. The lowest point: the nadir of their fortunes.

ETYMOLOGY:
Middle English, from Medieval Latin, from Arabic nar (as-samt), opposite (the zenith), from naara, to see, watch; see nr in Semitic roots


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The American Heritage® Dictionary of the English Language, Fourth Edition.
Copyright © 2000 by Houghton Mifflin Company.
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