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comparison microscope

noun, Optics.
1.
a microscope having two objective lenses and using a system of prisms to form in one eyepiece adjacent images of two different objects.
Origin of comparison microscope
1935-1940
1935-40
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Word Value for comparison

16
20
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