The diminishing of pigment in hair producing a range of colors from normal to white that is perceived as gray.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Examples from the Web for canities
Historical Examples of canities
It is common to advancing years (canities senilis); it is seen also exceptionally in early life (canities præmatura).Essentials of Diseases of the Skin
Henry Weightman Stelwagon