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| im·pu·ri·ty [ im pyrətee ] (plural im·pu·ri·ties) |
noun |
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| Definition: |
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1. lack of purity: the state or quality of being impure
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2. contaminant: a substance that adulterates or contaminates something
 drinking water that was found to contain impurities
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3. something added to semiconductor: a small amount of a substance added to a pure semiconductor to control its electrical conductivity
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