astigmatism
noun/əˈstɪɡmətɪzəm/
/əˈstɪɡmətɪzəm/
[uncountable] (medical)- a fault in the shape of a person’s eye that prevents them from seeing clearlyWord Originmid 19th cent.: from a- ‘without’ + Greek stigma ‘point’ + -ism.
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astigmatism