The Collaborative International Dictionary of English v.0.48:

Terebene \Ter"e*bene\, n. (Chem.)
   A polymeric modification of terpene, obtained as a white
   crystalline camphorlike substance; -- called also camphene.
   By extension, any one of a group of related substances.
   [1913 Webster]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Camphene \Cam"phene\ (k[a^]m"f[=e]n or k[a^]m*f[=e]n"), n.
   (Chem.)
   One of a series of substances C10H16, resembling camphor,
   regarded as modified terpenes.
   [1913 Webster]