Longman Dictionary of Contemporary English homepage

Topic: ILLNESS AND DISABILITY

Date: 1800-1900
Origin: A-2 + Greek stigma 'mark, point'; because there is no point at which light focuses

astigmatism

 noun
     
as‧tig‧ma‧tis‧m [uncountable]
MI difficulty in seeing clearly that is caused by a change in the inner shape of the eye
Definition of astigmatism from the Longman Dictionary of Contemporary English within
the topic ILLNESS AND DISABILITY
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