Common term is an oval
Mathematical is an ellipse
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An ellipse.
it is shaped roughly like a bell... a bell curve.
When the moon is shaped like a ball it is called a full moon.
It is a ring like object. The ring of a circus for example. Your definition would be a closed plane curve, consisting of all points from a given distance from a point within it, called the centre
A tangent is an object, like a line, which touches a curve. The tangent only touches the curve at one point. That point is called the point of tangency. The tangent does not intersect (pass through) the curve.