Dictionary.net

• A chromatophore or cell containing colouring matter.

1920 - A dictionary of scientific terms.
By Henderson, I. F.; Henderson, W. D.

• A cell in which the cell body contains minute masses or crystals of pigment. Pigment cells may be in the form of an epithelium, as in the pigment layer of the retina. In man, pigment cells are found in the eye, ear, nose, spleen, skin, and several other situations.

1916 - Appleton's medical dictionary
By Smith Ely Jelliffe