
1) Depigmentation 2) Loss of color from the hair
Found on
https://www.crosswordclues.com/clue/poliosis

Poliosis is the decrease or absence of melanin (or color) in head hair, eyebrows, or eyelashes. It can give rise to a `Mallen Streak` that can be hereditary. Catherine Cookson wrote a novel and later a TV series called The Mallen Streak, where a family had the condition. Sports presenter Dickie Davies and runner Sam Brown were famous for this fe.....
Found on
http://en.wikipedia.org/wiki/Poliosis

premature graying of the hair
Found on
http://phrontistery.info/p.html

A patchy absence or lessening of melanin in hair of the scalp, brows, or lashes, due to lack of pigment in the epidermis; it occurs in several hereditary syndromes but may be caused by inflammation, irradiation, or infection such as herpes zoster. ... Synonym: trichopoliosis. ... Origin: G., fr. Polios, gray ... (05 Mar 2000) ...
Found on
http://www.encyclo.co.uk/local/20973

(po″le-o´sis) circumscribed depigmentation of the hair, particularly of the scalp, occurring in association with or following various pathologic conditions. See also leukotrichia and canities.
Found on
http://www.encyclo.co.uk/local/21001

Type: Term Pronunciation: po′lē-ō′sis Definitions: 1. A patchy absence or lessening of melanin in hair of the scalp, brows, or lashes, due to lack of pigment in the epidermis; it occurs in several hereditary syndromes but may be caused by inflammation, irradiation, or infection such as herpes zoster. Synonyms: trichopoliosis &...
Found on
http://www.medilexicon.com/medicaldictionary.php?t=70739

[
n] - loss of color from the hair
Found on
http://www.webdictionary.co.uk/definition.php?query=poliosis
noun loss of color from the hair
Found on
https://www.encyclo.co.uk/local/20974

Whitening of the hair.
Found on
https://www.encyclo.co.uk/local/22445
No exact match found.