/ˈneɪ.dɪər/
NOUN
The lowest point reached by something, especially a period of difficulty, failure, depression, or decline; the point at which conditions are at their worst.
Used to describe the lowest stage or point in someone's fortunes, performance, career, reputation, or personal circumstances.
Used to refer to the bottommost position or deepest part of a physical space, structure, or area.
NOUN
The point on the celestial sphere directly below an observer, opposite the zenith; it is also associated with the downward direction of gravity.
Used in astronomy and navigation to identify the point on the celestial sphere directly beneath an observer, opposite the zenith.