Source : Webster's Revised Unabridged Dictionary (1913)

Olibanum \O*lib"a*num\, n. [LL., fr. Ar. al-luban frankincense;
   cf.Gr. ?, ?, of Semitic origin.]
   The fragrant gum resin of various species of {Boswellia};
   Oriental frankincense.

Source : WordNet®

Boswellia
     n : genus of incense-yielding trees of North Africa and India
         [syn: {genus Boswellia}]