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concave

adjective
🔊/kɒnˈkeɪv/
🔊/kɑːnˈkeɪv/
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  1. (of an outline or a surface轮廓或表面) curving in凹的；凹面的
    • a concave lens/mirror凹透镜；凹镜
    • The upper surface is slightly concave.上表面略凹。
    • The inside of a shiny spoon is a common example of a concave mirror.光亮的调羹内层就是一种常见的凹镜。
    opposite convexTopics Colours and Shapesc2
    Oxford Collocations DictionaryConcave is used with these nouns:
    • mirror
    See full entry
    Word Originlate Middle English: from Latin concavus, from con- ‘together’ + cavus ‘hollow’.