Real Dictionary

biochemistry
a series of observations, measurements, or facts; information [...]
an analysis, esp a determination of the amount of metal in an ore or the amounts of impurities in a precious metal [...]
description of character, traits, etc [...]
one of a number of auxiliary variables in terms of which all the variables in an implicit functional relationship can be explicitly expressed [...]
the study of the chemical compounds, reactions, etc, occurring in living organisms [...]
uncountable noun: Biochemistry is the study of the chemical processes that happen in living things.
uncountable noun: The biochemistry of a living thing is the chemical processes that happen in it or are involved in it.

biochemistry in American English
a science that deals with the chemistry of life processes in plants and animals
noun: the science dealing with the chemistry of living matter

biochemistry in British English
noun: the study of the chemical compounds, reactions, etc, occurring in living organisms