The Collaborative International Dictionary of English v.0.48:

Yawl-rigged \Yawl"-rigged"\, a. (Naut.)
   Having two masts with fore-and-aft sails, but differing from
   a schooner in that the after mast is very small, and stepped
   as far aft as possible. See Illustration in Appendix.
   [1913 Webster]