aspheric

adjective
aspher·​ic | \(ˌ)ā-ˈsfir-ik, -ˈsfer-\
variants: or aspherical \-​i-​kəl \

Definition of aspheric 

: departing slightly from the spherical form especially in order to correct for spherical aberration an aspheric lens

First Known Use of aspheric

1869, in the meaning defined above

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The first known use of aspheric was in 1869

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aspheric

adjective
aspher·​ic | \(ˈ)ā-ˈsfi(ə)r-ik, -ˈsfer- \
variants: or aspherical \-​i-​kəl \

Medical Definition of aspheric 

: departing slightly from the spherical form especially in order to correct for spherical aberration an aspheric lens

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