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ratiometer

American  
[rey-shee-om-i-ter] / ˌreɪ ʃiˈɒm ɪ tər /

noun

  1. (in three-color photography) a device for determining the exposure factors of the filters to be used.

Etymology

Origin of ratiometer

1920–25, for an earlier sense; ratio + -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.