1. (noun) stain, discoloration, discolouration
a soiled or discolored appearance
Synonyms: smear, discoloration, grease, dirt, spot, discolouration, grunge, blot, smirch, soil, stain, mark, filth, stigma, grime, brand
2. (noun) stain
(microscopy) a dye or other coloring material that is used in microscopy to make structures visible
Synonyms: smear, discoloration, grease, dirt, spot, discolouration, grunge, blot, smirch, soil, mark, filth, stigma, grime, brand
3. (noun) dirt, filth, grime, soil, stain, grease, grunge
the state of being covered with unclean things
Synonyms: land, territory, soil, spot, mark, grunge, filthiness, skank, discolouration, lubricating oil, grease, obscenity, discoloration, brand, foulness, ground, vulgarism, shit, dirty word, grime, stigma, scandal, crap, smear, shite, turd, dirt, smut, filth, malicious gossip, nastiness, smirch, stain, poop, crud, blot
4. (noun) mark, stigma, brand, stain
a symbol of disgrace or infamy
Synonyms: marking, soil, spot, mark, sucker, gull, steel, firebrand, target, crisscross, fall guy, grease, mug, score, discoloration, sign, make, brand, grade, smear, chump, dirt, grime, stigma, stain, home run, marque, scratch, discolouration, brand name, filth, patsy, blade, grunge, fool, trade name, smirch, scrape, cross, print, scar, bell ringer, sword, bull's eye, marker, soft touch, blot
5. (verb) blot, smear, smirch, spot, stain
an act that brings discredit to the person who does it
Synonyms: vilification, billet, berth, blot, place, spot, mark, grunge, touch, dapple, discolouration, post, grease, spotlight, topographic point, point, bit, brand, position, smear, cytosmear, grime, stigma, fleck, slur, dirt, maculation, daub, speckle, malignment, smudge, filth, discoloration, smirch, situation, office, stain, soil, pip, cytologic smear, patch
6. (verb) stain
color with a liquid dye or tint
Synonyms: defile, sully, maculate, tarnish
7. (verb) stain
produce or leave stains
Synonyms: defile, sully, maculate, tarnish
8. (verb) tarnish, stain, maculate, sully, defile
make dirty or spotty, as by exposure to air; also used metaphorically
Synonyms: calumniate, maculate, asperse, tarnish, smear, denigrate, slander, defile, corrupt, sully, stain, besmirch, smirch, defame, foul, taint, cloud, befoul
9. (verb) stain
color for microscopic study
Synonyms: defile, sully, maculate, tarnish
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Synonyms and Antonyms of stain 
