Denoting a paraboloidal surface, especially of a lens or mirror, that eliminates spherical aberration. [G. a- priv. + sphaira, sphere]
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aspher·ic (')ā-'sfi(ə)r-ik, -'sfer- or aspher·i·cal -i-kəl adj departing slightly from the spherical form esp. in order to correct for spherical aberration <an \aspheric lens>
Medical dictionary. 2011.