Source : Webster's Revised Unabridged Dictionary (1913)

Cedrene \Ce"drene\ (s[=e]"dr[=e]n), n. (Chem.)
   A rich aromatic oil, {C15H24}, extracted from oil of red
   cedar, and regarded as a polymeric terpene; also any one of a
   class of similar substances, as the essential oils of cloves,
   cubebs, juniper, etc., of which cedrene proper is the type.
   [Written also {cedren}.]