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Leucoscope
Leucoscope Leu"co*scope (l[=u]"k[-o]*sk[=o]p), n. [Leuco- +
-scope.] (Physics)
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.
Meaning of Leucoscope from wikipedia