STAIN

Definition

1. verb color with a liquid dye or tint.
2. verb produce or leave stains.
3. verb make dirty or spotty, as by exposure to air. — synonyms: tarnish, maculate, sully, defile
4. verb color for microscopic study.
5. noun a soiled or discolored appearance. — synonyms: discoloration, discolouration
6. noun (microscopy) a dye or other coloring material that is used in microscopy to make structures visible.
7. noun the state of being covered with unclean things. — synonyms: dirt, filth, grime, soil, grease, grunge
8. noun a symbol of disgrace or infamy. — synonyms: mark, stigma, brand
9. noun an act that brings discredit to the person who does it. — synonyms: blot, smear, smirch, spot