Noun

1. The chemistry of those compounds that occur in living organisms, and the processes that occur in their metabolism and catabolism

   I want to study biochemistry.

2. The chemical characteristics of a particular living organism

   The biochemistries of fungal and bacterial cells are quite distinct.

3. The 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.