Claude″ Lor‐raine″ glass′ (?). [Its name is supposed to be derived from the similarity of the effects it gives to those of a picture by Claude Lorrain (often written Lorraine).] A slightly convex mirror, commonly of black glass, used as a toy for viewing the reflected landscape.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.