What is the meaning of Nadir?

The point of the celestial sphere, directly opposite the zenith; inferior pole of the horizon; point of the celestial sphere directly under the place of observation.

The lowest point; time of greatest depression.

The axis of a projected conical shadow; the direction of the force of gravity at a location; down.

An empty box added beneath a full one in a beehive to give the colony more room to expand or store honey.

To extend (a beehive) by adding an empty box at the base.

rare

nadir

nadir (point of the celestial sphere directly under the place where the observer stands)

nadir

nadir (axis of projected conical shadow)

nadir (point of the celestial sphere directly under the place where the observer stands)

nadir (the lowest point)

nadir

nadir (point of the celestial sphere directly under the place where the observer stands)

rare

Source: wiktionary.org