transitive. Chiefly poetic. Of age, time, etc.: to turn (the hair) white or grey; to make hoary. Also with over. Cf. frosty, adj. 5a. Now rare.

transitive. To turn (the hair) white or grey; to make hoary. Cf. frost, v. 2. Obsolete. rare.

transitive. To make hoary or white, to whiten. In quot. 1616, To smite with hoar-leprosy.

To cause (the hair, etc.) to turn white like snow; to invest with white hair.