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How to sign: someone who travels into little known regions (especially for some scientific purpose)
Similiar / Same: adventurer
Within this category: conquistador, diver, navigator, potholer, Amundsen, Bartlett, Bougainville, Burton, Byrd, Cabot, Champlain, Clark, Cordoba, Cousteau, Flinders, Fremont, Frobisher, Hall, Jolliet, LaSalle, Lewis, Livingstone, Mackenzie, Nansen, Park, Peary, Pizarro, Rasmussen, Ross, Ross, Schoolcraft, Scott, Smith, Speke, Stanley, Sverdrup, Vizcaino, Wilkes, Wilkins