/ˈsaɪnəs ||; ˈsaɪnɪs/noun [C] (often plural 常用复数形式) one of the spaces in the bones of your face that are connected to your nose 鼻窦: I've got a terrible cold and my sinuses are blocked. 我得了重伤风，鼻子全塞了。a sinus infection 鼻窦感染