'Xiù jué' literally combines 嗅 (xiù), meaning 'to smell' or 'to sniff', and 觉 (jué), meaning 'perception' or 'sense'. Together, they form the abstract noun 'sense of smell' — one of the five traditional human senses. Unlike English, which uses a single compound word, Chinese constructs this term from two action/perception-related characters, emphasizing the active process of detecting odors through the nose.

This word appears in scientific, medical, and everyday contexts — for example, when discussing how dogs have a far stronger xiù jué than humans, or when describing loss of smell due to illness. It’s neutral in register and commonly used in both formal reports and casual conversation, especially when comparing sensory abilities across species or describing sensory changes during recovery from colds or infections.