化学系 (huà xué xì) literally means 'chemistry department' — it is a standard academic unit within a university or college responsible for teaching and research in chemistry. The character 化 (huà) means 'change' or 'transformation', reflecting chemistry’s focus on chemical reactions and transformations of matter; 学 (xué) means 'study' or 'learning'; and 系 (xì) means 'department' or 'division'. Together, the term denotes the institutional home for chemistry education and scholarship.

This word is used formally in academic contexts — for example, when referring to enrollment, faculty appointments, lab facilities, or administrative functions. It appears in official documents, university websites, campus maps, and student discussions about majors or course registration. Unlike broader terms like 'science faculty', 化学系 specifically refers to the organizational unit dedicated solely to chemistry, distinct from physics, biology, or other departments.