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focometer

[ foh-kom-i-ter ]

noun

Optics.
  1. an instrument for measuring the focal length of a lens or other optical system.

focometer

/ əʊˈɒɪə /

noun

  1. an instrument for measuring the focal length of a lens
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word History and Origins

Origin of focometer1

First recorded in 1850–55; foc(us) + -o- + -meter

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