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diameter

noun
🔊/daɪˈæmɪtə(r)/
🔊/daɪˈæmɪtər/
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  1. a straight line going from one side of a circle or any other round object to the other side, passing through the centre直径；对径
    • The diameter of the tree trunk was more than a metre.树干的直径超过一米。
    • in diameter The dome is 42.3 metres in diameter.这个穹顶直径为 42.3 米。🔊🔊
    compare radius
    Extra Examples
    • The mirror is 25cm in diameter.镜子的直径是25 厘米。
    • The tubes have an internal diameter of 2 mm.管子的内径是 2 毫米。
    • a method of calculating the diameter of the earth计算地球直径的一种方法
    • The radius of a circle is half its diameter.圆的半径是直径的一半。
    Topics Colours and Shapesc1, Maths and measurementc1
    Oxford Collocations Dictionaryadjective
    • inner
    • inside
    • internal
    • …
    verb + diameter
    • calculate
    • determine
    • estimate
    • …
    preposition
    • in diameter
    See full entry
  2. (specialist) a measurement of the power of an instrument to magnify something放大率；放大倍数
    • a lens magnifying 300 diameters (= making something look 300 times larger than it really is)放大 300 倍的透镜
    3. Word Originlate Middle English: from Old French diametre, via Latin from Greek diametros (grammē) ‘(line) measuring across’, from dia ‘across’ + metron ‘measure’.