Surd Definition

sûrd
noun
An irrational number or quantity; specif., a root which can be expressed only approximately.
5 is a surd.
Webster's New World
A voiceless sound.
Webster's New World
Synonyms:
voiceless consonant
adjective
Voiceless, as a sound.
American Heritage
Webster's New World
Webster's New World
(mathematics) Involving surds, or irrational numbers; not capable of being expressed in rational numbers.
A surd expression or quantity; a surd number.
Wiktionary

(phonetics) Unvoiced; voiceless.

Wiktionary
Synonyms:
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Other Word Forms of Surd

Noun

Singular:
surd
Plural:
surds

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

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