IPA: /ˌbaɪəʊrɪˌmiːdiˈeɪʃən/
KK: /ˌbaɪoʊrɪˌmiːdiˈeɪʃən/
The process of using living organisms, like bacteria or plants, to clean up and remove harmful substances from the environment, such as polluted soil or water.
Bioremediation is an effective method for cleaning up oil spills in oceans.
Bioremediation is formed from "bio-" (from Greek "bios", meaning life) and "remediation" (from Latin "remediare", meaning to remedy or correct). The term refers to the process of using living organisms to remedy or correct environmental problems, particularly pollution.
Think of 'life' ('bio-') being used to 'correct' ('remediare') environmental issues — that's what bioremediation means.