Definition of surd in English:

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surd

Pronunciation: /sərd/

adjective

1 Mathematics (Of a number) irrational.
2 Phonetics (Of a speech sound) uttered with the breath and not the voice (e.g., f, k, p, s, t).

noun

1 Mathematics A surd number, especially the irrational root of an integer.
Example sentences
  • They were learning about surds in maths, supposedly one of the hardest subjects.
  • I don't care about rationalising denominators with surds in them, and I don't care that by using maths induction you can prove many equations to be right or wrong.
  • In the conventional school education in India, we are asked to do some problems involving surds (radicals).
2 Phonetics A surd consonant.

Origin

Mid 16th century: from Latin surdus 'deaf, mute'; as a mathematical term, translating Greek (Euclid) alogos 'irrational, speechless', apparently via Arabic jiḏr aṣamm, literally 'deaf root'. The phonetics senses date from the mid 18th century.

For editors and proofreaders

Syllabification: surd

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