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anastigmat

[uh-nas-tig-mat, an-uh-stig-mat] /əˈnæs tɪgˌmæt, ˌæn əˈstɪg mæt/
noun, Optics.
1.
a compound lens corrected for the aberrations of astigmatism and curvature of field.
Origin
1885-1890
1885-90; < German, back formation from anastigmatisch anastigmatic
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for anastigmat

anastigmat

/æˈnæstɪɡˌmæt; ˌænəˈstɪɡmæt/
noun
1.
a lens or system of lenses designed to be free of astigmatism
Word Origin
C19 from an- + astigmatic
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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