The expression terpene was coined in 1866 by the German chemist August Kekulé to denote all hydrocarbons obtaining the empirical components C10H16, of which camphene was a single. Earlier, a lot of hydrocarbons owning the empirical formula C10H16 were named "camphene", but many other hydrocarbons of precisely the same composition https://angeloyysle.blazingblog.com/32866655/about-tetrahydrocannabinol