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aspherical

or aspheric

[ey-sfer-i-kuh l or ey-sfer-ik] /eɪˈsfɛr ɪ kəl or eɪˈsfɛr ɪk/
adjective, Optics.
1.
(of a reflecting surface or lens) deviating slightly from a perfectly spherical shape and relatively free from aberrations.
Origin of aspherical
1920-1925
1920-25; a-6 + spherical
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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