/ ˈkemɪstri; NAmE / noun [ U ]
1.
the scientific study of the structure of substances, how they react when combined or in contact with one another, and how they behave under different conditions :
a degree in chemistry
the university's chemistry department
inorganic / organic chemistry
—see also biochemistry
2.
( technical ) the chemical structure and behaviour of a particular substance :
the chemistry of copper
The patient's blood chemistry was monitored regularly.
3.
the relationship between two people, usually a strong sexual attraction :
sexual chemistry
The chemistry just wasn't right.