a. [ Hydro-, 2 + bromic. ] (Chem.) Composed of hydrogen and bromine; as, hydrobromic acid. [ 1913 Webster ]
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. [ 1913 Webster ]