stain /steɪn/verb 6noun 5forms 6phrases 1 verb6 •To discolor, as by spilling or other contact with a fluid or substance.armour stained with blood •To become stained; to take a stain. •To taint or tarnish someone's character or reputationof Honour void, Of Innocence, of Faith, of Puritie, Our wonted Ornaments now soild and staind — 1667 •To cause to seem inferior or soiled by comparison.She stains the ripest virgins of her age. — 1607 •To coat a surface with a stainto stain wood with acids, coloured washes, paint rubbed in, etc.the stained glass used for church windows •To treat (a microscopic specimen) with a dye, especially one that dyes specific features noun5 •A discolored spot or area caused by spillage or other contact with certain fluids or substances. •A blemish on one's character or reputation. •A substance used to soak into a surface and colour it.The wood will darken whether it is stained or not—the main function of a stain is to enhance the wood's natural color and emphasize its grain. — 1980 •A reagent or dye used to stain microscope specimens so as to make some structures visible. •One of a number of non-standard tinctures used chiefly in post-medieval heraldry, especially tenné, murrey, or sanguine. formsstain'd · stained · staining · staineth · stains · stainest Phrases with stain shit stainA spot or area that has been discolored by having absorbed feces.