First Known Use: 1610
Dictionary
1surd
adjective \ˈsərd\
Definition of SURD
1
: lacking sense : irrational <surd conceits of scripture's sense — Thomas Jackson>
2
: voiceless —used of speech sounds
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Origin of SURD
Latin surdus deaf, silent, stupid
2surd
noun
Definition of SURD
1
a : an irrational root (as √3) b : irrational number
2
: a surd speech sound
First Known Use of SURD
1557
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