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adj. Net having the sense of hearing; deaf. Unheard. (Math.) Involving surds; not capable of being expressed in rational numbers; radical; irrational; as, a surd expression or quantity; a surd number.


 - (Phonetics) Uttered, as an element of speech, without tone, or proper vocal sound; voiceless; unintonated; nonvocal; atonic; whispered; aspirated; sharp; hard, as f, p, s, etc.; - opposed to sonant.


 - n. (Math.) A quantity which cannot be expressed by rational numbers. (Phon.) A surd element of speech. See Surd, a.

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