The Collaborative International Dictionary of English v.0.48:
Whipcord \Whip"cord`\, n. A kind of hard-twisted or braided cord, sometimes used for making whiplashes. [1913 Webster]WordNet (r) 3.0 (2006):
whipcord n 1: closely twisted hard cord used for the lashes of whips 2: a strong worsted or cotton fabric with a diagonal rib