asymmetrical spinnaker
noun
variants or less commonly asymmetric spinnaker
: a spinnaker that has a forward edge that is longer than its after edge
Race director Randy Draftz said Saturday one of the Vipers was videotaped doing over 20 knots under its asymmetrical spinnaker … 
Will Haynie, Post and Courier (Charleston, South Carolina), 20 Apr. 2008
Will Haynie, Post and Courier (Charleston, South Carolina), 20 Apr. 2008
Word History
First Known Use
1984, in the meaning defined above