swelling
/ˈswelɪŋ/noun
1- an abnormal enlargement of a part of the body, typically as a result of an accumulation of fluid（身体上的）肿胀处（多由于积水引起）。
1.1
- a natural rounded protuberance自然突出部分：
the lobes are prominent swellings on the base of the brain.
脑叶是大脑基部明显可见的突出部分。