Noun
(organic chemistry) A hydrocarbon consisting an aromatic unit (typically a benzene ring) and an aliphatic chain that forms a bridge between two positions of the aromatic ring; more complex derivatives (the superphanes) with multiple aromatic units and bridges forming cagelike structures are known.
(organic chemistry) Any cyclic structure used as a base phane in the nomenclature of complex organic compounds
Source: en.wiktionary.org