chemistry/ˋkɛmIstrI; ˈkeməstri or ˈkemIstri/n [U] 1 the science that studies the structure of substances and the way that they change or combine with each other [→ biochemistry] 化学2 the way substances combine in a process, thing, person etc 化学组成: a person's body chemistry 人体化学结构3 if there is chemistry between two people, they like each other or work well together〔两个人之间的〕互相吸引﹔良好的工作关系