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Webster 1913 Edition

Surd

Surd

,
Adj.
[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

,
Noun.
(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
,
Adj.
, 4.

Webster 1828 Edition

Surd

SURD

,
Adj.
[L. surdus, deaf.] Deaf; not having the sense of hearing. [Not used.]
1.
Upheard. [Not used.]
2.
Designating a quantity whose root cannot be exactly expressed in numbers.

SURD

,
Noun.
In algebra, a quantity whose root cannot be exactly expressed in numbers. Thus 2 is a surd number, because there is no number which multiplied into itself, will exactly produce 2.

Definition 2024

sùrd

sùrd

See also: surd

Scottish Gaelic

Noun

sùrd f ‎(genitive sùird)

  1. cheerfulness, alacrity, eagerness

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