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radical sign

Syllabification: rad·i·cal sign

Definition of radical sign in English:

noun

Mathematics
The sign √, which indicates the square root of the number following (or a higher root indicated by a preceding superscript numeral).

Definition of radical sign in:

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Word of the day vigesimal
Pronunciation: ˌvīˈjesəm(ə)l
adjective
relating to or based on the number twenty