Cube roots'

cube root

noun Mathematics.
a quantity of which a given quantity is the cube: The cube root of 64 is 4.

Origin:
1690–1700

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Collins
World English Dictionary
cube root
 
n
the number or quantity whose cube is a given number or quantity: 2 is the cube root of 8 (usually written ³√ 8 or 81⁄3)

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
cube root  
The number whose cube is equal to a given number. For example, the cube root of 125 is 5, since 53 = 125.
The American Heritage® Science Dictionary
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