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surd

[surd] /sɜrd/
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
1545-1555
1545-55; < Latin surdus dull-sounding, mute, deaf
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for surdest

surd

/sɜːd/
noun
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 (t)
adjective
3.
of or relating to a surd
Word Origin
C16: from Latin surdus muffled
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for surdest

surd

adj.

1550s, "irrational" (of numbers), from Latin surdus "unheard, silent, dull," possibly related to susurrus "a muttering, whispering" (see susurration). The mathematical sense is from the use of Latin surdus to translate Arabic (jadhr) asamm "deaf (root)," itself a loan-translation of Greek alogos, literally "speechless, without reason" (Euclid book x, Def.). In French, sourd remains the principal word for "deaf."

Online Etymology Dictionary, © 2010 Douglas Harper
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