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nadir

nadir

1 9.9
The point in the sky directly under you opposite the highest point above you
  • noun
  • /ˈneɪdər/
  • Specialized
translation icon : nadir
  • In astronomy, the nadir is the point in the sky directly beneath an observer on Earth.
  • nadir CD4 count

Examples

  • For each participant, we also recorded age, ethnic origin, injection drug use, number of sexual partners, alcohol use, nadir CD4 count, lamivudine use, and HCV infection.

    Academic text (2002)
  • The nadir CD4 count was included in the analysis because it represents the most severe degree of immunosuppression reached by an individual.

    Academic text (2002)
  • The sun is then at its nadir, the furthest southern limit of its range, its terminus.

    Blog text (18)
  • 583 The cable reaches its nadir over an outcropping of rock on the cliff.

    Fiction book (1997)
  • Findings: There was a peak in the occurrence of childhood ITP during spring and a nadir in the autumn.

    Academic text (2001)
  • The mean hematocrit nadir during the admission for bleeding was 38.3%, and only one patient had a hematocrit below 30.0%.

    Academic text (2001)
  • However, HIV-1 seropositive men were more likely to have ever used injection drugs and had lower nadir CD4 counts than HIV-1 seronegative men.

    Academic text (2002)
  • The rate of liver-related death also increased as the nadir CD4 count fell from more than 250 cells/L to less than 100 cells/L (7.6, 3.1-19.5, p<0.001; table 4).

    Academic text (2002)
  • During the solar eclipse, the sun reaches its nadir when it is directly opposite the zenith.

  • In navigating, understanding the nadir helps astronomers locate stars and celestial objects below the observer.

Antonyms

zenith
  • Specialized
5 8.0

The point in the sky directly above you

Idioms

8.2

To fall to the lowest point in a situation, for example in money or confidence

Surface Forms

nadir singular
nadirs plural

Etymology

Nadir comes from Arabic and was used in old astronomy for the point in the sky 'directly beneath' an observer, the exact opposite of the zenith. So in technical terms it means the spot on the sky right below you.