canescent

from WordNet (r) 3.0 (2006)

canescent
    adj 1: of greyish white; "the canescent moon"
    2: covered with fine whitish hairs or down [syn: {canescent},
       {hoary}]

from The Collaborative International Dictionary of English v.0.48

Canescent \Ca*nes"cent\, a. [L. canescens, p. pr. of canescere,
   v. inchoative of canere to be white.]
   Growing white, or assuming a color approaching to white.
   [1913 Webster]