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Dipleidoscope is a 13 letter word which starts with the letter D and ends with the letter E for which we found 1 definitions.

(n.) An instrument for determining the time of apparent noon. It consists of two mirrors and a plane glass disposed in the form of a prism so that by the reflections of the sun's rays from their surfaces two images are presented to the eye moving in opposite directions and coinciding at the instant the sun's center is on the meridian.
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