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focometer

American  
[foh-kom-i-ter] / foʊˈkɒm ɪ tər /

noun

Optics.

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

focometer British  
/ 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

Etymology

Origin of focometer

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

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.