1. A soiled or discolored appearance (synset 104702524)
    "the wine left a dark stain"
  2. (microscopy) a dye or other coloring material that is used in microscopy to make structures visible (synset 115077537)
  3. The state of being covered with unclean things (synset 114521680)
  4. A symbol of disgrace or infamy (synset 106807523)
    "And the Lord set a mark upon Cain"
  5. An act that brings discredit to the person who does it (synset 100073081)
    "he made a huge blot on his copybook"
  1. Color with a liquid dye or tint (synset 200286768)
    "Stain this table a beautiful walnut color"; "people knew how to stain glass a beautiful blue in the middle ages"
  2. Produce or leave stains (synset 200287365)
    "Red wine stains the table cloth"
  3. Make dirty or spotty, as by exposure to air;
    Also used metaphorically (synset 201540197)
    "The silver was tarnished by the long exposure to the air"; "Her reputation was sullied after the affair with a married man"
  4. Color for microscopic study (synset 200284175)
    "The laboratory worker dyed the specimen"

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