The Collaborative International Dictionary of English v.0.48:

Etiolate \E"ti*o*late\ v. i. [imp. & p. p. Etiolated; p. pr. &
   vb. n. Etiolating.] [F. ['e]tioler to blanch.]
   1. To become white or whiter; to be whitened or blanched by
      excluding the light of the sun, as, plants.
      [1913 Webster]

   2. (Med.) To become pale through disease or absence of light.
      [1913 Webster]