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focometer

[foh-kom-i-ter] /foʊˈkɒm ɪ tər/
noun, Optics.
1.
an instrument for measuring the focal length of a lens or other optical system.
Origin
1850-1855
1850-55; foc(us) + -o- + -meter
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for focometer

focometer

/fəʊˈkɒmɪtə/
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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