The Collaborative International Dictionary
Pruinose
Pruinose \Pru"i*nose`\, a. [L. pruinosus, fr. pruina hoarfrost.] Frosty; covered with fine scales, hairs, dust, bloom, or the like, so as to give the appearance of frost.
Wiktionary
pruinose
a. (context botany English) Having a very fine whitish powder on a surface.