DCHP-1 Online
castor sec [< F "dry beaver"] Fur Trade, Hist. 
See parchment beaver 1957 quote.
See also: castor gras parchment beaver sec
- 1942 [Beaver skins were] called castor sec by the French. The guard hairs were still on the skin and the fur did not have the downy quality of castor gras, which was the result of long wear.
- 1964 The Hurons and Algonquins started up a brisk trade in worn-out kettles and second-hand axes for the Castor Gras of the Iriquois and in a short time, had them all wearing Castor Sec too. . . .
- 1942 [Beaver skins were] called castor sec by the French. The guard hairs were still on the skin and the fur did not have the downy quality of castor gras, which was the result of long wear.