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ruled surface

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ruled surface

–noun Geometry.
a surface that can be generated by a straight line, as a cylinder or cone.

Origin:
1860–65
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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ruled surface   (rōōld)
n.  A surface, such as a cone or cylinder, generated by the motion of a straight line.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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