adjective Optics.
(of a reflecting surface or lens) deviating slightly from a perfectly spherical shape and relatively free from aberrations.
Also, aspheric.

1920–25; a-6 + spherical Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Both boxes house complex optical trains of precision concave and convex aspherical mirrors.
Particles acted on by the potential can be extended aspherical or spherical particles, or point particles.
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