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English definition of “stain”

stain

noun [C]    /steɪn/
a dirty mark on something that is difficult to remove: The tomato sauce left a stain on the tablecloth. A stain is also a thin, oily liquid used to change the color of wood. biology A stain is also a chemical used to color cells to make them easier to see when studying them under a microscope.
(Definition of stain noun from the Cambridge Academic Content Dictionary © Cambridge University Press)
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