Definitions for staining

((histology) the use of a dye to color specimens for microscopic study)

(the act of spotting or staining something)

(color with a liquid dye or tint; "Stain this table a beautiful walnut color"; "people knew how to stain glass a beautiful blue in the middle ages")

(produce or leave stains; "Red wine stains the table cloth")

(make dirty or spotty, as by exposure to air; also used metaphorically; "The silver was tarnished by the long exposure to the air"; "Her reputation was sullied after the affair with a married man")

(color for microscopic study; "The laboratory worker dyed the specimen")