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From Biology-Online Dictionary | Biology-Online Dictionary
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1. To discolour by the application of foreign matter; to make foul; to spot; as, to stain the hand with dye; armor stained with blood.

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

3. To spot with guilt or infamy; to bring reproach on; to blot; to soil; to tarnish. Of honor void, Of innocence, of faith, of purity, Our wonted ornaments now soiled and stained. (milton)

4. To cause to seem inferior or soiled by comparison. She stains the ripest virgins of her age. (Beau. & Fl) That did all other beasts in beauty stain. (Spenser) Stained glass, glass coloured or stained by certain metallic pigments fused into its substance, often used for making ornament windows.

Synonym: To paint, dye, blot, soil, sully, discolour, disgrace, taint.

paint, Stain, dye. These denote three different processes; the first mechanical, the other two, chiefly chemical. To paint a thing is so spread a coat of colouring matter over it; to stain or dye a thing is to impart colour to its substance. To stain is said chiefly of solids, as wood, glass, paper; to dye, of fibrous substa 505 nces, textile fabrics, etc.; the one, commonly, a simple process, as applying a wash; the other more complex, as fixing colours by mordants.

Origin: Abbrev. Fr. Distain.