bioremediation Syllabification: (bi·o·re·me·di·a·tion)Pronunciation: /ˌbīōriˌmēdēˈāSHən/Definition of bioremediation noun the use of either naturally occurring or deliberately introduced microorganisms or other forms of life to consume and break down environmental pollutants, in order to clean up a polluted site. bioremediation in other Oxford dictionaries Definition of bioremediation in the British & World English dictionary