Bible Dictionaries
Leucoscope
Webster's Dictionary
(n.) An instrument, devised by Professor Helmholtz, for testing the color perception of the eye, or for comparing different lights, as to their constituent colors or their relative whiteness.
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Bibliography Information
Webster, Noah. Entry for 'Leucoscope'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​l/leucoscope.html. 1828.