Definition of astigmatism noun from the Oxford Advanced Learner's Dictionary



BrE BrE//əˈstɪɡmətɪzəm//
; NAmE NAmE//əˈstɪɡmətɪzəm//
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a fault in the shape of a person’s eye that prevents them from seeing clearly Word Origin mid 19th cent.: from a- ‘without’ + Greek stigma ‘point’ + -ism.
See the Oxford Advanced American Dictionary entry: astigmatism