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nadir

[ney-der, ney-deer] /ˈneɪ dər, ˈneɪ dɪər/
noun
1.
Astronomy. the point on the celestial sphere directly beneath a given position or observer and diametrically opposite the zenith.
2.
Astrology. the point of a horoscope opposite the midheaven: the cusp of the fourth house.
3.
the lowest point; point of greatest adversity or despair.
Origin
1350-1400
1350-1400; Middle EnglishArabic naẓīr over against, opposite to (the zenith)
Related forms
nadiral, adjective
Can be confused
nadir, zenith.
Synonyms
3. bottom, floor, foot, depths.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for nadiral

nadir

/ˈneɪdɪə; ˈnæ-/
noun
1.
the point on the celestial sphere directly below an observer and diametrically opposite the zenith
2.
the lowest or deepest point; depths the nadir of despair
Word Origin
C14: from Old French, from Arabic nazīr as-samt, literally: opposite the zenith
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for nadiral
nadir
c.1391, in astronomical sense, from M.L. nadir, from Arabic nazir "opposite to," in nazir as-samt, lit. "opposite of the zenith," from nazir "opposite" + as-samt "zenith" (see zenith). Transf. sense of "lowest point (of anything)" is first recorded 1793.
Online Etymology Dictionary, © 2010 Douglas Harper
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nadiral in Science
nadir
  (nā'dər)   
The point on the celestial sphere that is directly below the observer (90 degrees below the celestial horizon). Compare zenith.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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8
10
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