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]