nadir — ODE · Shobdo

nadir /ˈneɪdɪə

▸ noun [in singular]

1 the lowest or most unsuccessful point in a situation:

asking that question was the nadir of my career.

2 Astronomy the point on the celestial sphere directly below an observer. The opposite of zenith

– ORIGIN late Middle English (in nadir (sense 2 of the noun)): via French from Arabic naẓīr (as-samt) ‘opposite (to the zenith)’.