What is the meaning of stain?

noun

• A soiled or discolored appearance.
  • usage: "the wine left a dark stain"
  • synonyms: discoloration, discolouration
• Microscopy) a dye or other coloring material that is used in microscopy to make structures visible. (
• The state of being covered with unclean things.
  • synonyms: dirt, filth, grime, soil, grease, grunge
• A symbol of disgrace or infamy."And the Lord set a mark upon Cain-Genesis
  • synonyms: mark, stigma, brand
• An act that brings discredit to the person who does it.
  • usage: "he made a huge blot on his copybook"
  • synonyms: blot, smear, smirch, spot

verb

• Color with a liquid dye or tint.
  • usage: "Stain this table a beautiful walnut color"; "people knew how to stain glass a beautiful blue in the middle ages"
• Produce or leave stains.
  • usage: "Red wine stains the table cloth"
• Make dirty or spotty, as by exposure to air; also used metaphorically.
  • usage: "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
• Color for microscopic study.
  • usage: "The laboratory worker dyed the specimen"