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aspherical

or a·spher·ic

[ey-sfer-i-kuh l or ey-sfer-ik]
adjective Optics.
  1. (of a reflecting surface or lens) deviating slightly from a perfectly spherical shape and relatively free from aberrations.
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Origin of aspherical

First recorded in 1920–25; a-6 + spherical
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018