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(), a.[L. surdus deaf (whence the meaning, deaf to reason, irrational), perhaps akin to E. swart. Cf. Sordine.] 1. Net having the sense of hearing; deaf. [Obs.] "A surd . . . generation." Sir T. Browne. 2. Unheard. [Obs.] Kenrick. 3. (Math.) Involving surds; not capable of being expressed in rational numbers; radical; irrational; as, a surd expression or quantity; a surd number. 4. (Phon.) 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. See Guide to Pronunciation, 169, 179, 180. Surd n.(Math.) 1. A quantity which can not be expressed by rational numbers; thus, 2 is a surd. 2. (Phon.) A surd element of speech. See Surd, a., 4. スポンサード リンク
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