nadir

[ ney-der, ney-deer ]
/ ˈneɪ dər, ˈneɪ dɪər /
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noun

Astronomy. the point on the celestial sphere directly beneath a given position or observer and diametrically opposite the zenith.
Astrology. the point of a horoscope opposite the midheaven: the cusp of the fourth house.
the lowest point; point of greatest adversity or despair.

Origin of nadir

1350–1400; Middle EnglishArabic naẓīr over against, opposite to (the zenith)
SYNONYMS FOR nadir
3 bottom, floor, foot, depths.
Related formsna·dir·al, adjective
Can be confusednadir zenith
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for nadiral

nadir

/ (ˈneɪdɪə, ˈnæ-) /

noun

the point on the celestial sphere directly below an observer and diametrically opposite the zenith
the lowest or deepest point; depthsthe nadir of despair

Word Origin for nadir

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

Science definitions for nadiral

nadir

[ nādər ]

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.