The short diameter of an ellipse.

The shortest diameter of an ellipse; the line from one side of an ellipse to the other that passes midway between the foci and is perpendicular to the major axis. Also, the length of that line.

The shortest diameter of the ellipse that passes through the center. Alternatively, the line segment perpendicular to the major axis and through the center with endpoints on the ellipse.

The shorter axis of an ellipse.

() The axis passing through the center of an ellipse, perpendicular to the major axis. The shortest diameter distance between opposite points of an ellipse.

(n) The short axis of an ellipse. In a pictorial projection, the length of this axis varies with the relationship of the view direction to the surface of the circle the ellipse represents.