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irrational number

noun
🔊/ɪˌræʃənl ˈnʌmbə(r)/
🔊/ɪˌræʃənl ˈnʌmbər/
(also surd)
(mathematics数学)
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  1. a number, for example π or the square root of 2, that cannot be expressed as the ratio of two whole numbers无理数Topics Maths and measurementc2