Source : Webster's Revised Unabridged Dictionary (1913)

Physiography \Phys`i*og"ra*phy\, n.
   The descriptive part of a natural science as distinguished
   from the explanatory or theoretic part; as, mineral
   physiography.

Physiography \Phys`i*og"ra*phy\, n. [Gr. fy`sis nature +
   -graphy: cf. F. physiographie.]
   The science which treats of the earth's exterior physical
   features, climate, life, etc., and of the physical movements
   or changes on the earth's surface, as the currents of the
   atmosphere and ocean, the secular variations in heat,
   moisture, magnetism, etc.; physical geography.

Source : WordNet®

physiography
     n : the study of physical features of the earth's surface [syn:
         {physical geography}]