The Collaborative International Dictionary of English v.0.48:

Insolate \In"so*late\, v. t. [imp. & p. p. Insolated; p. pr. &
   vb. n. Insolating.] [L. insolatus, p. p. of insolare to
   expose to the sun; pref. in- in + sol the sun.]
   To dry in, or to expose to, the sun's rays; to ripen or
   prepare by such exposure. --Johnson.
   [1913 Webster]

WordNet (r) 3.0 (2006):

insolate
    v 1: 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]