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2017 Word of the Year

parfocal

[pahr-foh-kuh l] /pɑrˈfoʊ kəl/
adjective, Optics.
1.
of or relating to different eyepieces (of telescopes or microscopes) that all focus their images in the same plane, so that they can be interchanged without readjusting the instrument.
Origin of parfocal
1885-1890
First recorded in 1885-90; par1 + focal
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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