bioremediation \bi`o*re*me*di*a"tion\, n.
   the branch of biotechnology that uses biological processes to
   overcome environmental problems.
   [WordNet 1.6]

	

	bioremediation
     n 1: the branch of biotechnology that uses biological process to
          overcome environmental problems
     2: the act of treating waste or pollutants by the use of
        microorganisms (as bacteria) that can break down the
        undesirable substances