The Collaborative International Dictionary
Tropilidene
Tropilidene \Tro*pil"i*dene\, n. [See Tropine.] (Chem.) A liquid hydrocarbon obtained by the dry distillation of tropine with quicklime. It is regarded as being homologous with dipropargyl.
Wiktionary
tropilidene
n. (context obsolete organic chemistry English) The hydrocarbon ''cyclohepta-1,3,5-triene'', or any of its derivatives