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major axis

noun, Mathematics.
1.
the axis of an ellipse that passes through the two foci.
Origin of major axis
1850-1855
First recorded in 1850-55
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for major axis
Historical Examples
• These marks will then represent the diameter of the ellipse across its major axis.

J. S. Zerbe
• The proper thing is, first, to draw a line (A), which is called the "major axis."

J. S. Zerbe
• We may take any point along the major axis, as shown, for instance, in Fig. 149.

J. S. Zerbe
• Surface armed with thirty to forty very large three-sided prismatic spines, longer than the major axis of the shell.

• Polar spines three-sided pyramidal, about as long as the major axis of the shell; their basal thickness equals one mesh.

• Polar spines conical, straight; the longer twice as long as the major axis, the minor scarcely half as long.

• The minor axis or greatest breadth is about one-half the major axis or length.

David Todd
• But pour a beam of direct sunlight from end to end along its major axis.

Henry White Warren
• Kepler found the sun to be in one focus, say S. AB is the major axis.

George Forbes
• The line drawn through the longest part of an ellipse is called the major axis.

E. A. Allen
British Dictionary definitions for major axis

major axis

noun
1.
the longer or longest axis of an ellipse or ellipsoid
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition