aplanatic 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.
Optics corrected for spherical aberration and coma: said of a lens
Origin: ; from Classical Greek aplanētos, unerring ; from a-, not plush planan: see planet
aplanatic definition by American Heritage Dictionary
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.
Of or relating to optical systems that correct for spherical aberration.
Origin: From a-1 + Greek planāsthai, to wander; see pelə-2 in Indo-European roots.
aplanatic - Medical Definition
Of or relating to an optical lens that is free from chromatic or spherical aberration.