形容詞 concave:

1. curving inward

1. A long stick with a concave attachment at one end for shoving disks in shuffleboard.
   推鏟一端帶有凹頭的長棒，用于在打圓盤游戲中推動圓盤
2. A concave molding with a cross section that approximates a quarter circle.
   飛檐的凹圓線腳截面近于九十度弧的凹線腳
3. An indented or concave surface or area.
   凹陷，洼地凹的表面或地區(qū)
4. His figure looks very funny in the concave mirror.
   他的樣子在凹鏡里顯得非?？尚Α?/div>

con.cave

adj.（形容詞）
Curved like the inner surface of a sphere.
凹的：象球體的內(nèi)表面一樣彎曲的
n.（名詞）
A concave surface, structure, or line.
凹面、凹形結(jié)構(gòu)、或凹線
v.tr.（及物動詞）
con.caved,con.cav.ing,con.caves
To make concave.
使…凹陷

來源：
Middle English
中古英語
from Latin concavus
源自 拉丁語 concavus
com- [intensive pref.] * see com-
com- [前綴，表加強詞義] *參見 com-
cavus [hollow] * see keu…-
cavus [中空的] *參見 keu…-

【引伸】
concave.ly
adv.（副詞）
concave.ness
n.（名詞）