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directrix

 
Dictionary: di·rec·trix   (dĭ-rĕk'trĭks, dī-) pronunciation
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directrix
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directrix

The directrix at both ends of this general cylinder prints red.
(Academy Artworks)
n., pl., di·rec·trix·es, or di·rec·tri·ces (dī'rĕk-trī'sēz).
  1. Mathematics. A fixed curve traversed by a generatrix in generating a conic section or a cylinder.
  2. The median line in the trajectory of fire of an artillery piece.

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Dictionary. The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.  Read more