• (n.) A compound of hydrobromic acid with a base; -- distinguished from a bromide, in which only the bromine unites with the base.
Hy`dro·bro'mide noun (Chemistry) A compound of hydrobromic acid with a base; -- distinguished from a bromide , in which only the bromine unites with the base. 
a salt formed by the direct union of hydrobromic acid and an organic base, esp. an alkaloid, usually more soluble than the base.