cycloheptatrieneWiktionary 原文英美构词拆解cyclocyclo-前缀heptatrieneheptatriene词干cyclo-Circle, circular. · (chemistry) A cyclic compound.词源说明From cyclo- + heptatriene.释义名词noun1(organic chemistry) A cycloalkene having a seven-membered ring and three double bonds; removal of a hydride ion produces the aromatic tropylium ion