(kә-nish´e-ēz) grayness or whiteness of the scalp hair, especially as associated with aging. See also leukotrichia and poliosis. Found on http://www.encyclo.co.uk/local/21001
A pigment deficiency frequently seen in middle-aged people of either sex. Close examination of greying hair confirms that it is an illusion caused by the presence of white hairs among a percentage of normal dark pigmented hairs. Found on https://www.goodsalonguide.com/community/hair-and-beauty-glossary