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HELIOSPHERE

11 letters

◐ IN SOME DICTIONARIES
TWL06 ✓ SOWPODS ✓ ENABLE1 ✗
Classic 11 pts
Big 11 pts
Super Big 22 pts

HELIOSPHERE is a valid 11-letter Boggle word. It's listed in TWL06 and SOWPODS but not ENABLE1. It scores 11 in Classic, 11 in Big, and 22 in Super Big Boggle.

noun
  1. The region of space where interstellar medium is blown away by solar wind; the boundary, heliopause, is often considered the edge of the Solar System.