concave
/kɒnˈkeɪv/adjective
- having an outline or surface that curves inwards like the interior of a circle or sphere（轮廓, 表面）凹的。比较CONVEX（义项1）。
派生词
concavely
adverbconcavity
noun词源
late Middle English: from Latin concavus, from con- 'together'+cavus 'hollow'.