Bicyclic alkenes having a double bond between the bridgehead atoms and a transattachment of each branch to the double bond. Thus trans-bicyclo[m.n.0]alk-1 (m+2)-enes.
Source:
PAC, 1995, 67, 1307
(Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995))
on page 1322
