An‐as′tig‐mat″ic (?), a. [Pref. an-not + astigmatic.] (Optics) 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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.