(of a number) irrational.
(of a speech sound) uttered with the breath and not the voice (e.g., f, k, p, s, t)
A surd number, especially the irrational root of an integer.
- ‘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.’
- ‘They were learning about surds in maths, supposedly one of the hardest subjects.’
- ‘In the conventional school education in India, we are asked to do some problems involving surds (radicals).’
A surd consonant.
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.
We take a look at several popular, though confusing, punctuation marks.