protrusion
noun [ C or U ] uk/prəˈtruː.ʒən/ us/prəˈtruː.ʒən/
突出物;伸出，凸起
something that sticks out from a surface, or the act of doing this
It has a series of protrusions along its back. 它背上有一连串的凸起。
The condition results in weight loss, rapid heart beat and protrusion of the eyes. 这种病会导致体重下降、心动过速和眼球凸出。