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


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)

Related forms

na·dir·al, adjective

Can be confused

nadir zenith Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for nadir

British Dictionary definitions for nadir


/ (ˈneɪdɪə, ˈnæ-) /


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 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.