aplanatic


ap·la·nat·ic

adj \ˌap-lə-ˈnat-ik, ˌā-plə-\

Definition of APLANATIC

: free from or corrected for spherical aberration <an aplanatic lens>
ap·la·nat·i·cal·ly \-i-k(ə-)lē\ adverb

Seen & Heard

What made you want to look up aplanatic? Please tell us where you read or heard it (including the quote, if possible).