Found 2 items, similar to Aplanatic.
English → English (WordNet) Definition: aplanatic aplanatic adj : free from or corrected for spherical aberration; “an aplanatic mirror”
English → English (gcide) Definition: Aplanatic Aplanatic \Ap`la*nat"ic\, a. [Gr. 'a priv. + ? disposed to wander, wandering, ? to wander.] (Opt.) Having two or more parts of different curvatures, so combined as to remove spherical aberration; -- said of a lens. [1913 Webster] Aplanatic focus of a lens (Opt.), the point or focus from which rays diverging pass the lens without spherical aberration. In certain forms of lenses there are two such foci; and it is by taking advantage of this fact that the best aplanatic object glasses of microscopes are constructed. [1913 Webster]