1
: a substance that imparts black or white or a color to other materials
especially
: a powdered substance that is mixed with a liquid in which it is relatively insoluble and used especially to impart color to coating materials (such as paints) or to inks, plastics, and rubber
2
: a coloring matter in animals and plants especially in a cell or tissue
also
: any of various related colorless substances
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Merriam-Webster unabridged
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