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ellipse
The line running through the foci (F and F1) of an ellipse is the major axis. The vertices (V and V1) mark where the major axis intersects the ellipse. The midpoint between the vertices is the center; the line that runs vertically through the center is the minor axis.
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
The dark circle within the cone is an ellipse.
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