/ˈkemɪstri ||; ˈkɛmɪstrɪ/noun [U]:
1 the scientific study of the structure of substances and what happens to them in different conditions or when mixed with each other 化学: We did an experiment in the chemistry lesson today. 我们今天上化学课的时候做了一个实验。
2 the structure of a particular substance 化学结构；化学特性