Definitions
from The Century Dictionary.
 noun In mathematics, a circumscribed circle.
from Wiktionary, Creative Commons Attribution/ShareAlike License.
 noun mathematics A
circle that passes through everyvertex of a giventriangle (or otherpolygon where possible)
Etymologies
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Examples

←→ ←→ In Figure 5.24, point P is on the circumcircle of ABC.
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Begin by considering the circumcircle of ABC (see Figure 6.5).
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For example, the perpendiculars drawn to the three sides of a triangle from any point on its circumcircle intersect the sides in three collinear points (Simson's invariant).
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Simson's Theorem The feet of the perpendiculars drawn from any point on the circumcircle of a triangle to the sides of the triangle are collinear.
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As an example consider what the circumcircle of a triangle that has all 3 of its points being collinear would look like, how would you write the routine to be robust, when would you need to have a robust routine like that?
The Code Project Latest Articles Arash Partow 2009

AD, BE&CF are cevians (not necessarily congruent) in triangleABCintersecting the circumcircle at P, Q, R (details)?

AD, BE&CF are cevians (not necessarily congruent) in triangleABCintersecting the circumcircle at P, Q, R (details)?

AD, BE&CF are cevians (not necessarily congruent) in triangleABCintersecting the circumcircle at P, Q, R (details)?

AD, BE&CF are cevians (not necessarily congruent) in triangleABCintersecting the circumcircle at P, Q, R (details)?
bilby commented on the word circumcircle
I think it's round.
November 28, 2008
oroboros commented on the word circumcircle
Close to round: circa circumcircle
November 29, 2008