circle

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circle circle of Willis

Main Entry: cir·cle
Pronunciation: sr-kl
Function: noun
1 a : a closed plane curve every point of which is equidistant from a fixed point within the curve b : the plane surface bounded by such a curve
2 : something (as an anatomical part) in the form of a circle or section of a circle <an arterial circle> -- see CIRCLE OF WILLIS