Source : Webster's Revised Unabridged Dictionary (1913)

Bdellium \Bdel"lium\, n. [L., fr. Gr. ?; cf. Heb. b'dolakh
   bdellium (in sense 1).]
   1. An unidentified substance mentioned in the Bible (--Gen.
      ii. 12, and --Num. xi. 7), variously taken to be a gum, a
      precious stone, or pearls, or perhaps a kind of amber
      found in Arabia.

   2. A gum resin of reddish brown color, brought from India,
      Persia, and Africa.

   Note: Indian bdellium or false myrrh is an exudation from
         Balsamodendron Roxb?rghii. Other kinds are known as
         African, Sicilian, etc.

Source : WordNet®

bdellium
     n : aromatic gum resin; similar to myrrh