Pronunciation: (im-pyoor'i-tē), [key]
—pl. -ties for 2.
1. the quality or state of being impure.
2. Often, impurities. something that is or makes impure: After the flood the authorities warned against impurities in the drinking water.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.