definition of
stain

[1] #1 stain v. color with a liquid dye or tint; "Stain this table a beautiful walnut color"; "people knew how to stain glass a beautiful blue in the middle ages". wn

[2] #2 stain n. [discoloration, discolouration] a soiled or discolored appearance; "the wine left a dark stain". wn

[3] #3 stain n. (microscopy) a dye or other coloring material that is used in microscopy to make structures visible. wn

[4] #4 stain v. produce or leave stains; "Red wine stains the table cloth". wn

[5] #5 stain n. [dirt, filth, grime, soil, grease, grunge] the state of being covered with unclean things. wn