Glau″cous (gla̤″kŭs), a. [L. glaucus, Gr. γλαυκόσ.] 1. Of a sea-green color; of a dull green passing into grayish blue. Lindley.
2. (Bot.) Covered with a fine bloom or fine white powder easily rubbed off, as that on a blue plum, or on a cabbage leaf. Gray.