Definition of pigment:
dry coloring material (especially a powder to be mixed with a liquid to produce paint, etc.)
any substance whose presence in plant or animal tissues produces a characteristic color
a substance used as a coating to protect or decorate a surface (especially a mixture of pigment suspended in a liquid); dries to form a hard coating; "artists use `paint' and `pigment' interchangeably"
acquire pigment; become colored or imbued
color or dye with a pigment; "pigment a photograph"