The Collaborative International Dictionary of English v.0.48:

Solarize \So"lar*ize\, v. t. [imp. & p. p. Solarized; p. pr. &
   vb. n. Solarizing.] (Photog.)
   To injure by too long exposure to the light of the sun in the
   camera; to burn.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Solarize \So"lar*ize\, v. i. (Photog.)
   To become injured by undue or too long exposure to the sun's
   rays in the camera; -- an older term now replaced by
   overexpose.
   [1913 Webster +PJC]

WordNet (r) 3.0 (2006):

solarize
    v 1: reverse some of the tones of (a negative or print) and
         introduce pronounced outlines of highlights, by exposing it
         briefly to light, then washing and redeveloping it [syn:
         solarize, solarise]
    2: become overexposed; "The film solarized" [syn: solarize,
       solarise]
    3: overexpose to sunlight; "be careful not to solarize the
       photographic film" [syn: solarize, solarise]
    4: expose to the rays of the sun or affect by exposure to the
       sun; "insolated paper may turn yellow and crumble"; "These
       herbs suffer when sunned" [syn: sun, insolate,
       solarize, solarise]