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surd   WordNet 2.0

- a consonant produced without sound from the vocal cords

 
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- of speech sounds

 
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Surd   Webster's Revised Unabridged Dictionary (1913)

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. (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. See Guide to Pronunciation, §§169, 179, 180.

 
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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.

 
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