Pronunciation: (nā'dur, nā'dēr), [key]
1. Astron.the point on the celestial sphere directly beneath a given position or observer and diametrically opposite the zenith.
2. Astrol.the point of a horoscope opposite the midheaven: the cusp of the fourth house.
3. the lowest point; point of greatest adversity or despair.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.