n. [ F., Sp., & It. nadir; all fr. Ar. nazīru's samt nadir, prop., the point opposite the zenith (as samt), in which nazīr means alike, corresponding to. Cf. Azimuth, Zenith. ]
The seventh century is the nadir of the human mind in Europe. Hallam. [ 1913 Webster ]
Nadir of the sun (Astron.),