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ratiometer

 - 1 dictionary result

ra⋅ti⋅om⋅e⋅ter

[rey-shee-om-i-ter]
–noun
(in three-color photography) a device for determining the exposure factors of the filters to be used.

Origin:
1920–25, for an earlier sense; ratio + -meter
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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