hyperchromatism

[ hī′pər-krōmə-tĭz′əm ]

n.

Excessive formation of skin pigment. hyperchromia
A condition in which cells or parts of cells, especially cell nuclei, stain more intensely than normal. hyperchromasia

Other words from hyperchromatism

hy′per•chro•matic (-krə-mătĭk) adj.