ratio-meter

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

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Ratio-meter is always a great word to know.
So is bezoar. Does it mean:
the offspring of a zebra and a donkey.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
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