Boggledygook

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DIPLEIDOSCOPE

13 letters

◐ IN SOME DICTIONARIES
TWL06 ✗ SOWPODS ✓ ENABLE1 ✗
Classic 11 pts
Big 11 pts
Super Big 26 pts

DIPLEIDOSCOPE is a valid 13-letter Boggle word. It's listed in SOWPODS but not TWL06 and ENABLE1. It scores 11 in Classic, 11 in Big, and 26 in Super Big Boggle.

noun
  1. An instrument for determining the time of apparent noon. It consists of two mirrors and a plane glass 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 centre is on the meridian.