stain
noun
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an act that brings discredit to the person who does itblotsmearsmirchspot
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a soiled or discolored appearance“the wine left a dark stain”discolorationdiscolouration
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a symbol of disgrace or infamymarkbrandstigma
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the state of being covered with unclean thingsdirtfilthsoilgrimegreasegrunge
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(microscopy) a dye or other coloring material that is used in microscopy to make structures visible
verb
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color for microscopic study
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color with a liquid dye or tint
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produce or leave stains“Red wine stains the table cloth”
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make dirty or spotty, as by exposure to airmaculatetarnishdefilesully