- a discoloration produced by foreign matter having penetrated into or chemically reacted with a material; a spot not easily removed.
- a natural spot or patch of color different from that of the basic color, as on the body of an animal.
- a cause of reproach; stigma; blemish: a stain on one’s reputation.
- coloration produced by a dye that penetrates a substance, as wood.
- a dye made into a solution for coloring woods, textiles, etc.
- a reagent or dye used in treating a specimen for microscopic examination.
verb (used with object)
- to discolor with spots or streaks of foreign matter.
- to bring reproach or dishonor upon; blemish.
- to sully with guilt or infamy; corrupt.
- to color or dye (wood, cloth, etc.) by any of various processes that change or react with the substance chemically.
- to color with something that penetrates the substance.
- to treat (a microscopic specimen) with some reagent or dye in order to color the whole or parts and so give distinctness, contrast of tissues, etc.
verb (used without object)
- to produce a stain.
- to become stained; take a stain: This fabric stains easily.
verb (mainly tr)
- to mark or discolour with patches of something that dirtiesthe dress was stained with coffee
- to dye with a penetrating dyestuff or pigment
- to bring disgrace or shame onto stain someone’s honour
- to colour (specimens) for microscopic study by treatment with a dye or similar reagent
- (intr) to produce indelible marks or discolorationdoes ink stain?
- a spot, mark, or discoloration
- a moral taint; blemish or slur
- a dye or similar reagent, used to colour specimens for microscopic study
- a solution or liquid used to penetrate the surface of a material, esp wood, and impart a rich colour without covering up the surface or grain
- any dye that is made into a solution and used to colour textiles and hides
late 14c., probably representing a merger of Old Norse steina “to paint” and a shortened form of Middle English disteynen “to discolor or stain,” from Old French desteign-, stem of desteindre “to remove the color,” from des- (from Latin dis- “remove;” see dis-) + Old French teindre “to dye,” from Latin tingere (see tincture). Related: Stained; staining. Stained glass is attested from 1791.
1560s, from stain (v.).
- A reagent or dye that is used for staining microscopic specimens.
- A procedure in which a dye or a combination of dyes and reagents is used to color the constituents of cells and tissues.
- To treat specimens for the microscope with a reagent or dye that makes visible certain structures without affecting others.