Bible Dictionaries
Aplanatic

Webster's Dictionary

(a.) Having two or more parts of different curvatures, so combined as to remove spherical aberration; - said of a lens.

Bibliography Information
Webster, Noah. Entry for 'Aplanatic'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​a/aplanatic.html. 1828.