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Decontamination The process of removing contaminants, such as germs or pollutants, from a surface or object. ■ After spilling milk on her shirt, Jane quickly ran to the kitchen to decontaminate it before it could smell bad.
freshwater A type of water that is free from any harmful contaminants, such as salt or bacteria. ■ "I can't believe you drank the freshwater from the pond! It was probably teeming with all sorts of dangerous critters!"
Purest The person or thing that is completely free from impurities, contaminants or anything that could be considered harmful or undesirable. ■ When it comes to eating, the purest person I know is my grandma. She only eats fruits and vegetables and has never even tasted junk food!