
1) Coloration 2) Colouration 3) Loss of pigment
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https://www.crosswordclues.com/clue/depigmentation

1) Poliosis
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https://www.crosswordclues.com/clue/depigmentation

Depigmentation is the lightening of the skin, or loss of pigment. Depigmentation of the skin can be caused by a number of local and systemic conditions. The pigment loss can be partial (injury to the skin) or complete (caused by vitiligo). It can be temporary (from tinea versicolor) or permanent (from albinism). Most commonly, depigmentation of th...
Found on
http://en.wikipedia.org/wiki/Depigmentation

(de- + pigmentation) removal or loss of pigment, especially melanin.
Found on
http://users.ugent.be/~rvdstich/eugloss/DIC/dictio24.html

<dermatology> The removal or loss of pigment, especially melanin. ... (18 Nov 1997) ...
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http://www.encyclo.co.uk/local/20973

(de-pig″mәn-ta´shәn) removal or loss of pigment, especially melanin, such as in amelanosis, leukoderma, vitiligo, and other conditions.
Found on
http://www.encyclo.co.uk/local/21001

Type: Term Pronunciation: dē′pig-men-tā′shŭn Definitions: 1. Loss of pigment which may be partial or complete.
Found on
http://www.medilexicon.com/medicaldictionary.php?t=23802

Depigmentation: Loss of color (pigment) from the skin, mucous membranes, hair, or retina of the eye. The color of the skin, mucous membranes, hair, and retina is due to the deposition of melanin, which is a coloring matter. Melanin is produced by specialized cells called melanocytes. Other terms pertaining to pigment include pigmentation (the prese...
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http://www.medterms.com/script/main/art.asp?articlekey=9682

Erasing the color pigments from hair is known as depigmentation. A simple osmosis method is used by Great Lengths to erase the color pigments from the hair. Only Great Lengths uses this method while other companies still rely on methods such as bleaching the hair that can destroy the cuticle and hair to a great extent.
Found on
http://www.naishairextensions.com/hair-extensions-glossary/

Localized loss of normal skin color.
Found on
http://www.thehorse.com/Glossary.xhtml?L=D

[
n] - absence or loss of pigmentation (or less than normal pigmentation) in the skin or hair
Found on
http://www.webdictionary.co.uk/definition.php?query=depigmentation

depigmentation 1. Absence, or partial loss, of pigmentation (or less than normal pigmentation) of the pigment melanin; especially, in the skin, eyes, or hair. 2. Loss of color (pigment) from the skin, mucous membranes, hair, or retina of the eyes.
Found on
http://www.wordinfo.info/words/index/info/view_unit/1670/
noun absence or loss of pigmentation (or less than normal pigmentation) in the skin or hair
Found on
https://www.encyclo.co.uk/local/20974

loss of pigment.
Found on
https://www.infoplease.com/dictionary/depigmentation
No exact match found.