Noun
a consonant produced without sound from the vocal cords

Adjective
of speech sounds

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a.
Net having the sense of hearing; deaf.

a.
Unheard.

a.
Involving surds; not capable of being expressed in rational numbers; radical; irrational; as, a surd expression or quantity; a surd number.

a.
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.

n.
A quantity which can not be expressed by rational numbers; thus, Ã2 is a surd.

n.
A surd element of speech. See Surd, a., 4.

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Surd

Surd , 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. (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.

Surd

Surd, n. (Math.) 1. A quantity which can not be expressed by rational numbers; thus, 'fb2 is a surd. 2. (Phon.) A surd element of speech. See Surd, a., 4.

Net having the sense of hearing; deaf.

A quantity which can not be expressed by rational numbers; thus, 'fb2 is a surd.