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English definition of “stain”

stain

verb [I/T]  /steɪn/ us  
to leave a mark on something that is difficult to remove, or to become colored or spoiled by a mark: [T] Strawberry juice stained my shirt. [I] This carpet is practical because it doesn’t stain easily. If you stain wood, you put a substance on it that changes its color: [T] Instead of painting the woodwork, she stained it dark brown.
stainless
adjective  /ˈsteɪn·ləs/ us  

stain

noun [C]  /steɪn/ us  
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 from the Cambridge Academic Content Dictionary © Cambridge University Press)
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