surd

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surd / sərd/ • adj. 1. Math. (of a number) irrational. 2. Phonet. (of a speech sound) uttered with the breath and not the voice (e.g., f, k, p, s, t). • n. 1. Math. a surd number, esp. the irrational root of an integer. 2. Phonet. a surd consonant.