protuberance
/prəʊˈtjuːbərəns/noun
1- a thing that protrudes from something else隆起物, 凸出物：
some dinosaurs evolved protuberances on top of their heads.
一些恐龙从头顶上进化出隆起部分。
1.1
- mass noun the fact or state of protruding隆起, 凸出：
the large size and protuberance of the incisors.
凸出的大门牙。