n. a man who lived on or was familiar with the prairies in early times.
- 1801  (1920)  Jas. Ruchan began yesterday to make plainsmen's coat for Ind. . . .
- 1887  I have heard plainsmen, who were all their lives on the plain, say that it is impossible to have a cross between the buffalo and domesticated cattle.
- 1939  After a careful examination of the two, I confess that my faith in the average plainsmen's tradition?whether red or white?is very weak.
- 1963  He would use this skilled plainsman against the American traders who were making incursions on Hudson's Bay Company territory.