Source : Webster's Revised Unabridged Dictionary (1913)

Solarization \So`lar*i*za"tion\, n. (Photog.)
   Injury of a photographic picture caused by exposing it for
   too long a time to the sun's light in the camera; burning;
   excessive insolation.

Source : WordNet®

solarization
     n : exposure to the rays of the sun [syn: {solarisation}]