surd

surd

[surd]
adjective
1.
Phonetics. voiceless (opposed to sonant ).
2.
Mathematics. (of a quantity) not capable of being expressed in rational numbers; irrational.
noun
3.
Phonetics. a voiceless consonant (opposed to sonant ).
4.
Mathematics. a surd quantity.

Origin:
1545–55; < Latin surdus dull-sounding, mute, deaf

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World English Dictionary
surd (sɜːd)
 
n
1.  maths an expression containing one or more irrational roots of numbers, such as 2√3 + 3√2 + 6
2.  phonetics a voiceless consonant, such as ()
 
adj
3.  of or relating to a surd
 
[C16: from Latin surdus muffled]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

surd
1551, "irrational" (of numbers), from L. surdus "unheard, silent, dull," possibly related to susurrus "a muttering, whispering" (see susurration). The mathematical sense is from the use of L. surdus to translate Ar. (jadhr) asamm "deaf (root)," itself a loan-translation
of Gk. alogos, lit. "speechless, without reason" (Euclid bk. x, Def.). In Fr., sourd remains the principal word for "deaf."
Online Etymology Dictionary, © 2010 Douglas Harper
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