anastigmatic[an as′tig mat′ik, an′ə stig-]
anastigmatic definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
free from, or corrected for, astigmatism; specif., designating a compound lens made up of one converging and one diverging lens so that the astigmatism of one is neutralized by the equal and opposite astigmatism of the other
anastigmatic definition by American Heritage Dictionary
Free from astigmatism. Used of a compound lens in which the separate components compensate for the astigmatic effects of each lens.