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]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]