nadir

Definition of Nadir in English :

an extreme state of adversity; the lowest point of anything

2. nadir

the point below the observer that is directly opposite the zenith on the imaginary sphere against which celestial bodies appear to be projected

WordNet Lexical Database for English. Princeton University. 2010.

Nadir

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

noun

1.

that point of the celestial sphere directly opposite to the zenith and directly below the observer

2.

the lowest point

n.

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.