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Definition of surd noun from the Oxford Advanced Learner's Dictionary

 

surd

 noun
noun
BrE BrE//sɜːd//
 
; NAmE NAmE//sɜːrd//
 
(mathematics)
 
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= irrational number Word Origin mid 16th cent.: from Latin surdus ‘deaf, mute’; as a mathematical term, translating Greek (Euclid) alogos ‘irrational, speechless’, apparently via Arabic jid̲r aṣamm, literally ‘deaf root’.
See the Oxford Advanced American Dictionary entry: surd

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