compound of bromine and another metal or radical, 1836, from bromine, the pungent, poisonous element, + -ide. Used as a sedative; figurative sense of "dull, conventional person or trite saying" popularized by U.S. humorist Frank Gelett Burgess (1866-1951) in his book "Are You a Bromide?" (1906). Related: Bromidic.
bromide bro·mide (brō'mīd')
A binary compound of bromine with another element, especially a salt containing monovalent negatively charged bromine.
[1900s+; fr the use of bromide as a sedative]