Source : Webster's Revised Unabridged Dictionary (1913)

Hydrobromic \Hy`dro*bro"mic\, a. [Hydro-, 2 + bromic.] (Chem.)
   Composed of hydrogen and bromine; as, hydrobromic acid.

   {Hydrobromic acid} (Chem.), a colorless, pungent, corrosive
      gas, {HBr}, usually collected as a solution in water. It
      resembles hydrochloric acid, but is weaker and less
      stable. Called also {hydrogen bromide}.

Source : WordNet®

hydrogen bromide
     n : a colorless gas that yields hydrobromic acid in solution
         with water