A Nadir

1. 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. Antonym: zenith
2. (figuratively) The lowest point; time of greatest depression. Synonyms: lowest ebb, slough of despond, trough, bathosAntonyms: height, peak
3. (astronomy) The axis of a projected conical shadow; the direction of the force of gravity at a location; down. Synonym: down
4. (beekeeping, archaic) An empty box added beneath a full one in a beehive to give the colony more room to expand or store honey. Antonyms: duplet, super