SURD
    
Meaning of SURD in English
	
n.
Function: noun
 Date: 1557
1 a : an irrational root (as √ 3) b : IRRATIONAL NUMBER
2 : a surd speech sound
	
	
	Merriam Webster Collegiate English Dictionary.
    	Merriam Webster - Энциклопедический словарь английского языка.
	2012