Meaning of SURD in English

SURD

/ sɜːd; NAmE sɜːrd/ noun

( mathematics ) = irrational number

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WORD ORIGIN

mid 16th cent.: from Latin surdus deaf, mute; as a mathematical term, translating Greek (Euclid) alogos irrational, speechless, apparently via Arabic jiḏr aṣamm , literally deaf root.

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.