Medical Laboratory Terms

noun a colored patch or dirty mark that is difficult to remove

verb to leave a mark on something that is difficult to remove

• The red wine stain on the white tablecloth was difficult to remove.
• I accidentally spilled coffee on the carpet and now there's a huge stain.
• She was so mad that she threatened to stain his reputation if he didn't apologize.
• The scandal left a permanent stain on the politician's career.

adjective describing a state of being free from contamination or pollution

• The water from the mountain spring is completely uncontaminated.
• I prefer to drink uncontaminated water straight from the source.
• Dude, this place serves the most uncontaminated sushi in town.
• Her mind was like an uncontaminated garden, free from negative thoughts.