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STAIN

Definition:

[noun] a soiled or discolored appearance; "the wine left a dark stain"
Synonyms: discoloration, discolouration
[noun] (microscopy) a dye or other coloring material that is used in microscopy to make structures visible
[noun] the state of being covered with unclean things
Synonyms: dirt, filth, grime, soil, grease, grunge
[noun] a symbol of disgrace or infamy; "And the Lord set a mark upon Cain"
Synonyms: mark, stigma, brand
[noun] an act that brings discredit to the person who does it; "he made a huge blot on his copybook"
Synonyms: blot, smear, smirch, spot
[verb] 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"
[verb] produce or leave stains; "Red wine stains the table cloth"
[verb] make dirty or spotty, as by exposure to air; also used metaphorically; "The silver was tarnished by the long exposure to the air"; "Her reputation was sullied after the affair with a married man"
Synonyms: tarnish, maculate, sully, defile
[verb] color for microscopic study; "The laboratory worker dyed the specimen"