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What does excircle mean?

Looking for the meaning or definition of the word excircle? Here's what it means.

Noun
  1. (geometry) An escribed circle; a circle outside a polygon (especially a triangle, but also sometimes a quadrilateral) that is tangent to each of the lines on which the sides of the polygon lie.
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Examples
Now suppose that the excircle is tangent to AB extended and AC extended at X and Y, respectively.
Also since the circle of inversion cuts both excircles orthogonally, each excircle inverts into itself.

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