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From The Collaborative International Dictionary of English v.0.48:
Pigment \Pig"ment\, n. [L. pigmentum, fr. the root of pingere to paint: cf. F. pigment. See Paint, and cf. Pimento, Orpiment.] 1. Any material from which a dye, a paint, or the like, may be prepared; particularly, the refined and purified coloring matter ready for mixing with an appropriate vehicle. [1913 Webster] 2. (Physiol.) Any one of the colored substances found in animal and vegetable tissues and fluids, as bilirubin, urobilin, chlorophyll, etc. [1913 Webster] 3. Wine flavored with species and honey. --Sir W. Scott. [1913 Webster] Pigment cell (Physiol.), a small cell containing coloring matter, as the pigmented epithelial cells of the choroid and iris, or the pigmented connective tissue cells in the skin of fishes, reptiles, etc. [1913 Webster] Pigmental