A process by which pollution from such sources as sewage effluent or leachate from fertilized fields causes a lake, pond, or fen to become overrich in organic and mineral nutrients, so that algae and cyanobacteria grow rapidly and deplete the oxygen supply.
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014. S.v. "eutrophication." Retrieved August 15 2016 from http://www.thefreedictionary.com/eutrophication