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ratiometer

American

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

noun

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

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