aspheric
American Heritage Dictionary:
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a·spher·ic
(ā-sfîr'ĭk, ā-sfĕr'-) 
also a·spher·i·cal (-ĭ-kəl)
adj.
Varying slightly from sphericity and having only slight aberration, as a lens.
also a·spher·i·cal (-ĭ-kəl)adj.
Varying slightly from sphericity and having only slight aberration, as a lens.
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American Heritage 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.
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