A discoloured spot or area.
A blemish on one's character or reputation.
A substance used to soak into a surface and colour it.
A reagent or dye used to stain microscope specimens so as to make some structures visible.
Any of a number of non-standard tinctures used in modern heraldry.
To discolour.
To taint or tarnish someone's character or reputation
To coat a surface with a stain
To become stained; to take a stain.
To treat (a microscopic specimen) with a dye, especially one that dyes specific features
To cause to seem inferior or soiled by comparison.