1. 1934, Rex Stout, Fer-de-Lance, 1992 Bantam edition, →ISBN, page 93: It's a Bigeneric hybrid, they don't come in nature like that

2. Antivenin (Crotalidae) polyvalent a serum containing specific venom-neutralizing globulins, produced by immunizing horses with venoms of the fer-de-lance and the western, eastern, and tropical rattlesnakes, used for treatment of envenomation by most pit vipers throughout the world.