aplanatic
(adjective) free from or corrected for spherical aberration; “an aplanatic mirror”
Source: WordNet® 3.1
aplanatic (comparative more aplanatic, superlative most aplanatic)
(optics, of an optical system) Free from, or corrected for, spherical aberration and chromatic aberration
• antapical
Source: Wiktionary
Ap`la*nat"ic, a. Etym: [Gr. (Opt.)
Definition: Having two or more parts of different curvatures, so combined as to remove spherical aberration; -- said of a lens. 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.
Source: Webster’s Unabridged Dictionary 1913 Edition
6 June 2025
(noun) wit having a sharp and caustic quality; “he commented with typical pungency”; “the bite of satire”
According to Guinness World Records, on 25 September 2016, the Birla Institute of Management Technology (India) in Uttar Pradesh, India, constructed the largest coffee cups pyramid consisting of 23,821 cups. They used paper takeaway coffee cups to build the pyramid.
