Plural form of circumradius; multiple radii of circumscribed circles.
From Latin circum- (around) + radius (ray), with the English plural suffix -es, used in mathematics and geometry when discussing multiple circumscribed circles.
Mathematicians debate whether to say 'circumradii' (Latin plural) or 'circumradiuses' (English plural)—it's a small word war that reveals how English is constantly wrestling with its Latin inheritance.
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