Definition of "pigmentation"

It may hence be assumed that this apparently capillary pigmentation should be ascribed merely to an accumulation of pigment-molecules towards one side of the hepatic cells.

1855, Carl Wedl, Rudiments of Pathological Histology

The neoplasm which, since the time of Laennec, is known by the designation Melanosis, is to be carefully distinguished from this pigmentation of the ordinary structures of the lung, which has been designated Anthracosis.

1858, Rudolf Virchow, “The Pathology of Miners' Lung”, in Edinburgh Medical Journal, volume 4, page 205

In order to help understand the pigmentary changes which occur throughout the aging process and in the management of aging skin, it is necessary to examine how pigmentation varies among different ethnicities.

2009, Miranda A. Farage, Textbook of Aging Skin, page 503