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
16 May 2025
(adjective) marked by columniation having free columns in porticoes either at both ends or at both sides of a structure
Coffee dates back to the 9th century. Goat herders in Ethiopia noticed their goats seem to be “dancing” after eating berries from a particular shrub. They reported it to the local monastery, and a monk made a drink out of it. The monk found out he felt energized and kept him awake at night. That’s how the first coffee drink was born.
