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parfocal

[ pahr-foh-kuhl ]

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.


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Word History and Origins

Origin of parfocal1

First recorded in 1885–90; par 1 + focal

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parflechepar for the course