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| surd [ surd ] (plural surds) |
noun |
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| Definition: |
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1. irrational root or number: in mathematics, an irrational root or irrational number, or an expression containing one or the other
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2. voiceless sound: a consonant pronounced without vibration of the vocal cords
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| [Mid-16th century. < Latin surdus "unable to hear or speak"] |
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