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Webster's 1913 Dictionary

ANASTIGMATIC

ANASTIGMATIC An *as `tig *mat "ic, a. [Pref. an-not + astigmatic. ] (Optics )

Defn: Not astigmatic; --said esp. of a lens system which consists of a converging lens and a diverging lens of equal and opposite astigmatism but different focal lengths, and sensibly free from astigmatism.

New American Oxford Dictionary

anastigmatic

an as tig mat ic |ˌanəstigˈmatik ˌænəˌstɪɡˈmædɪk | ▶adjective (of a lens system ) constructed so that the astigmatism of each element is canceled out. ORIGIN late 19th cent.: from an- 1 ‘not ’ + astigmatic (see astigmatism ).

Oxford Dictionary

anastigmatic

anastigmatic |ˌanəstɪgˈmatɪk | ▶adjective (of a lens system ) constructed so that the astigmatism of each element is cancelled out. ORIGIN late 19th cent.: from an- 1 ‘not ’ + astigmatic (see astigmatism ).