Dictionary.net

an act that brings discredit to the person who does it; "he made a huge blot on his copybook"

a symbol of disgrace or infamy; "And the Lord set a mark upon Cain"--Genesis

the state of being covered with unclean things

a soiled or discolored appearance; "the wine left a dark stain"

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

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"

(microscopy) a dye or other coloring material that is used in microscopy to make structures visible

an act that brings discredit to the person who does it; "he made a huge blot on his copybook"

a symbol of disgrace or infamy; "And the Lord set a mark upon Cain"--Genesis

the state of being covered with unclean things

a soiled or discolored appearance; "the wine left a dark stain"

a dye or other coloring material that is used in microscopy to make structures visible

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

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"

To discolor by the application of foreign matter; to make foul; to spot; as, to stain the hand with dye; armor stained with blood.

To color, as wood, glass, paper, cloth, or the like, by processess affecting, chemically or otherwise, the material itself; to tinge with a color or colors combining with, or penetrating, the substance; to dye; as, to stain wood with acids, colored washes, paint rubbed in, etc.; to stain glass.

To spot with guilt or infamy; to bring reproach on; to blot; to soil; to tarnish.

To give or receive a stain; to grow dim.

A discoloration by foreign matter; a spot; as, a stain on a garment or cloth.

A natural spot of a color different from the gound.

Taint of guilt; tarnish; disgrace; reproach.

Cause of reproach; shame.

A tincture; a tinge.

A discoloration; spot or blot; a dye; taint of guilt or crime; cause of reproach.

To blot; spot; mark with color; to dye; soil with guilt or crime.

To take or make a stain.

1. To discolor. 2. To color, to dye. 3. A discoloration. 4. A dye used in histological and bacteriological technique.

To tinge or color: to give a different color to: to dye: to mark with guilt or infamy: to bring reproach on: to sully: to tarnish.

A discoloration: a spot: taint of guilt: cause of reproach: shame.

Spot of color; color; discoloration; disgrace.

To dye; tinge; discolor; sully; tarnish; disgrace.

To make a stain upon; impart a stain to; color or discolor.

To take or impart a stain.

A discoloration.

A dye used in staining.

A moral taint; tarnish.

Stainless.

Discolouration; a spot of a colour different from the ground; taint of guilt; reproach; cause of reproach.

To discolour or spot with foreign matter; to tinge; to impress with figures of a different colour from the ground; to soil; to mark with guilt or infamy.

To discolour; to tinge of a different colour; to blot; to render foul; to tarnish; to bring reproach; to mark with guilt or infamy; to impress or mark with a variety of colours.

A blot; a foul spot; a spot of colour; taint of guilt; infamy; disgrace.

A material used in coloring tissues.

A discoloration, or a discolored spot.

A pigment used for staining microscopic objects such as bacteria, minute animal parasites, and sections of normal or diseased tissues in order to make that substance capable of study under the microscope. The stains include many anilin dyes and various other chemical materials. They are described in detail in the various text-books devoted to bacteriology, pathology, histology, and medical zoology.

A preparation made from various anilin, vegetable, or mineral dyes, and used to color microscopic organisms and histological and pathological tissues for purposes of microscopic study.

n. A discoloration from foreign matter; a blot ; a foul mark ;-a natural spot of a colour different from the ground ;-disgrace ; infamy; taint of guilt;-cause of reproach; shame.