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boulder noun

  /ˈboʊldɚ/ , /ˈbəʊl.də(ɹ)/
  • A large mass of stone detached from the surrounding land.
 Felsblock, Fels, Felsbrocken

bouldering noun

  • (climbing) Climbing, without ropes, on large boulders or boulder-sized objects.
 Bouldern
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