- 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. [1913 Webster]
The Collaborative International Dictionary of English. 2000.