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plural frontiersmen
A person who lives on the borders of a country, or in a wild and undeveloped area on the fringes of civilization. quotations examples
The inhabitant's of England's North American colonies outnumbered French Canadians some ten to one, but the French were tough, fur-trapping frontiersmen who posed a considerable military threat.
2002, Colin Jones, The Great Nation, Penguin, published 2003, pages 136–7