Definitions from Wiktionary ( )

▸ noun:  A discolored spot or area caused by spillage or other contact with certain fluids or substances.
▸ noun:  A blemish on one's character or reputation.
▸ noun:  A substance used to soak into a surface and colour it.
▸ noun:  A reagent or dye used to stain microscope specimens so as to make some structures visible.
▸ noun:  (heraldry) One of a number of non-standard tinctures used chiefly in post-medieval heraldry, especially tenné, murrey, or sanguine.
▸ verb:  (transitive) To discolor, as by spilling or other contact with a fluid or substance.
▸ verb:  To taint or tarnish someone's character or reputation
▸ verb:  To coat a surface with a stain
▸ verb:  (intransitive) To become stained; to take a stain.
▸ verb:  (transitive, cytology, histology) To treat (a microscopic specimen) with a dye, especially one that dyes specific features
▸ verb:  To cause to seem inferior or soiled by comparison.

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