Definitionen
1.NounThe 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.
2.NounThe lowest point; time of greatest depression.
3.NounThe axis of a projected conical shadow; the direction of the force of gravity at a location; down."The nadir of the sun is the axis of the shadow projected by the Earth."
4.NounAn empty box added beneath a full one in a beehive to give the colony more room to expand or store honey.
5.VerbTo extend (a beehive) by adding an empty box at the base.