n a soiled or discolored appearance
n (microscopy) a dye or other coloring material that is used in microscopy to make structures visible
n the state of being covered with unclean things
n a symbol of disgrace or infamy
n an act that brings discredit to the person who does it
v color with a liquid dye or tint
v produce or leave stains
v make dirty or spotty, as by exposure to air; also used metaphorically
v color for microscopic study