anastigmatic
a. கதிர் முனைப்புக் கேடற்ற.
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.