( n. )
A plane figure, bounded by a single curve line called its circumference, every part of which is equally distant from a point within it, called the center.
( n. )
A plane figure, bounded by a single curve line called its circumference, every part of which is equally distant from a point within it, called the center.
Webster's Revised Unabridged English Dictionary. Пересмотренный полный словарь английского языка Webster. 2012