anastigmat

anastigmat

[uh-nas-tig-mat, an-uh-stig-mat]
noun Optics.
a compound lens corrected for the aberrations of astigmatism and curvature of field.

Origin:
1885–90; < German, back formation from anastigmatisch anastigmatic

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World English Dictionary
anastigmat (æˈnæstɪɡˌmæt, ˌænəˈstɪɡmæt)
 
n
a lens or system of lenses designed to be free of astigmatism
 
[C19 from an- + astigmatic]

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