concave

形容词 concave:

1. curving inward

1. A long stick with a concave attachment at one end for shoving disks in shuffleboard.
   推铲一端带有凹头的长棒，用于在打圆盘游戏中推动圆盘
2. A concave molding with a cross section that approximates a quarter circle.
   飞檐的凹圆线脚截面近于九十度弧的凹线脚
3. An indented or concave surface or area.
   凹陷，洼地凹的表面或地区
4. His figure looks very funny in the concave mirror.
   他的样子在凹镜里显得非常可笑。

con.cave

adj.（形容词）
Curved like the inner surface of a sphere.
凹的：象球体的内表面一样弯曲的
n.（名词）
A concave surface, structure, or line.
凹面、凹形结构、或凹线
v.tr.（及物动词）
con.caved,con.cav.ing,con.caves
To make concave.
使…凹陷

来源：
Middle English
中古英语
from Latin concavus
源自 拉丁语 concavus
com- [intensive pref.] * see com-
com- [前缀，表加强词义] *参见 com-
cavus [hollow] * see keu…-
cavus [中空的] *参见 keu…-

【引伸】
concave.ly
adv.（副词）
concave.ness
n.（名词）