biochemical
adjective(bio-chem-i-cal)
of or relating to biochemistry
biochemical
adjective(bio-chem-i-cal)
characterized by, produced by, or involving chemical reactions in living organisms
biochemical
noun(bio-chem-i-cal)
the oxygen used in meeting the metabolic needs of aerobic microorganisms in water rich in organic matter (such as water polluted with sewage)