stigmatism

noun
stig·ma·tism | \ˈstigməˌtizəm\
plural -s

Definition of stigmatism 

: the condition of an optical system (such as a lens or mirror) in which rays of light from a single point converge in a single focal point — compare astigmatism

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History and Etymology for stigmatism

Latin stigmat-, stigma + English -ism

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