1.a soiled or discolored appearance;
the wine left a dark stain
2.(microscopy) a dye or other coloring material that is used in microscopy to make structures visible
3.the state of being covered with unclean things
4.a symbol of disgrace or infamy;
And the Lord set a mark upon Cain--Genesis
5.an act that brings discredit to the person who does it;
he made a huge blot on his copybook
1.color with a liquid dye or tint;
Stain this table a beautiful walnut color
2.produce or leave stains;
Red wine stains the table cloth
3.make dirty or spotty, as by exposure to air; also used metaphorically;
The silver was tarnished by the long exposure to the air
4.color for microscopic study;
The laboratory worker dyed the specimen