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Definition of: surd
(sûrd) noun
1. Math. An irrational number or quantity, especially an indicated root that can only be approximated, as √2.
2. Phonet. A speech sound made without vibration of the vocal cords.
—adjective
1. Math. Incapable of being expressed in rational numbers; irrational.
2. Phonet. Voiceless; opposed to sonant, voiced. [<L surdus deaf, silent]
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