DCHP-1 Online
Castor [< Cdn F] Hist. 
n. a faction of Quebec Conservatives of the period 1882-1900.
- 1904 In this case the danger sprang from among the most advanced Conservatives of his following, those whom Protestants called Ultramontaines, and loyal Conservatives nicknamed Castors.
- 1963 As a result, Bourassa's nationalism became ever more a defensive, Quebec nationalisme, resembling that of the Castors which preceded it. . . .
- 1904 In this case the danger sprang from among the most advanced Conservatives of his following, those whom Protestants called Ultramontaines, and loyal Conservatives nicknamed Castors.