1.NounThe chemistry of those compounds that occur in living organisms, and the processes that occur in their metabolism and catabolism; the study of such chemistry.
"My aunt has a degree in biochemistry."
2.NounThe chemical characteristics of a particular living organism.
"The biochemistries of fungal and bacterial cells are quite distinct."
3.NounThe biochemical activity associated with a particular chemical or condition.
"Our study compared the biochemistries of epilepsy and Parkinson's.; The biochemistry of NO differs from that of NO2."