anastigmat
noun
an·as·tig·mat a-ˈna-stig-ˌmat 
ˌa-nə-ˈstig-
ˌa-nə-ˈstig- : an anastigmatic lens
Word History
Etymology
German, back-formation from anastigmatisch anastigmatic
First Known Use
1889, in the meaning defined above
Medical Definition
anastigmat
noun
an·astig·mat a-ˈnas-tig-ˌmat ˌan-ə-ˈstig-
ˌan-ə-ˈstig- : an anastigmatic lens