The Collaborative International Dictionary of English v.0.48:

Corduroy \Cor"du*roy`\ (k[^o]r"d[-u]*roi` or k[^o]r`d[-u]*roi"),
   n. [Prob. for F. corde du roi king's cord.]
   1. A sort of cotton velveteen, having the surface raised in
      ridges.
      [1913 Webster]

   2. pl. Trousers or breeches of corduroy.
      [1913 Webster]

   Corduroy road, a roadway formed of logs laid side by side
      across it, as in marshy places; -- so called from its
      rough or ribbed surface, resembling corduroy. [U.S.]
      [1913 Webster]