concavity
noun [ C or U ] uk/ˌkɒnˈkæv.ə.ti/ us/ˌkɑːnˈkæv.ə.t̬i/
凹形
the quality of curving in, or an object or surface that curves in
The valley looks utterly serene now - a spacious concavity lying between pine-clad peaks. 峡谷是一大片洼地，坐落在松林覆盖的山峦之间，此时显得寂静无声。
There is the slightest hint of concavity that allows the bottle to fit snugly in my grip. 瓶子几无凹处，不容易握住。
See: concave
- More examples
- The gland is situated within the skull in a small concavity.
- a small concavity in the grass where moisture may collect
- a curving, cuplike concavity