Surd meaning

sûrd
An irrational number, such as √2.
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A voiceless sound in speech.
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Voiceless, as a sound.
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An irrational number or quantity; specif., a root which can be expressed only approximately.

5 is a surd.

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A voiceless sound.
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(arithmetic) An irrational number, especially one expressed using the √ symbol.
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(linguistics) A voiceless consonant.
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(mathematics) Involving surds, or irrational numbers; not capable of being expressed in rational numbers.

A surd expression or quantity; a surd number.

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(phonetics) Unvoiced; voiceless.
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Origin of surd

  • Medieval Latin surdus speechless, surd (translation of Arabic (jaḏr) ’aṭamm deaf (root), surd) (translation of Greek alogos speechless, surd) from Latin

    From American Heritage Dictionary of the English Language, 5th Edition

  • Latin surdus (“deaf"); in mathematical sense, "deaf to reason", i.e. irrational.

    From Wiktionary