Definitions
(adjective)
concave; sunken; indented
(adjective)
sunken; depressed (of terrain)
Etymology
Pictograph of a concavity. Opposite of 凸.
About
The character "凹" derives from a pictographic origin, designed to visually represent a sunken or indented shape directly through its written form. Its structure is not composed of separate semantic or phonetic components but stands as an integral symbol depicting concavity, historically aligned with the radical for container or receptacle. The essential meaning of denoting a depression or hollow has persisted through its usage, while its application has extended from describing physical terrain to serving technical roles in disciplines such as geometry and descriptive linguistics, maintaining a consistent conceptual core based on its illustrative design.
Example Sentences Hide
地面上有一个凹坑。
凹透镜可以发散光线。
这块木板表面凹凸不平。
汽车撞出了一个凹痕。
山谷呈凹形，易于蓄水。
工程师设计了凹槽以固定零件。
由于长期挤压，金属板出现了凹陷。
在光学系统中，凹面镜用于汇聚光线。