concavity
🇺🇸
/kɑːnˈkævəti/
🇬🇧
/kɒnˈkævəti/
A curved inward shape or surface.
The cave had a smooth concavity that echoed when you clapped.
這個洞穴有一個平滑的凹面,拍手時會有回聲。
An inward curve or bend.
The concavity of the spoon made it perfect for serving soup.
湯匙的凹面使它非常適合盛湯。