Anastigmatic
Pronunciation : An*as`tig*mat"ic
Part of Speech : a. [Pref. an-not + astigmatic.] (Optics)
Definition : 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.
Source : Webster's Unabridged Dictionary, 1913