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1. (adj.) surd
(of a speech sound) voiceless
2. surd
(of a quantity) not capable of being expressed in rational numbers; irrational.
3. (n.) surd
a voiceless consonant.
4. surd
a surd quantity.
Etymology: (1545–55; < L surdus muted, lit., deaf)
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| Definition of 'surd' |
Princeton's WordNet |
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1. (adj) surd, voiceless consonant
a consonant produced without sound from the vocal cords
2. (adj) unvoiced, voiceless, surd, hard
produced without vibration of the vocal cords
"unvoiced consonants such as `p' and `k' and `s'"
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| Definition of 'surd' |
Webster Dictionary |
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1. (adj) surd
net having the sense of hearing; deaf
2. (adj) surd
unheard
3. (adj) surd
involving surds; not capable of being expressed in rational numbers; radical; irrational; as, a surd expression or quantity; a surd number
4. (adj) surd
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
5. (noun) surd
a quantity which can not be expressed by rational numbers; thus, Ã2 is a surd.
6. (noun) surd
a surd element of speech. See Surd, a., 4
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Definitions of surd 
