aspheric

aspherical

[ey-sfer-i-kuhl]
adjective Optics.
(of a reflecting surface or lens) deviating slightly from a perfectly spherical shape and relatively free from aberrations.
Also, aspheric.


Origin:
1920–25; a-6 + spherical

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
aspheric

adjective
varying slightly from a perfectly spherical shape 
aspherical

adjective
varying slightly from a perfectly spherical shape [syn: aspheric
WordNet® 3.0, © 2006 by Princeton University.
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