bromideyoudaoicibaDictYouDict
bromide: [19] Potassium bromide is used as a sedative, and it was that which inspired the American humorist Gelett Burgess’s book Are You A Bromide? (1906), in which he metaphoricized bromide as a ‘dull conventional person’. In British English it is the more abstract figurative sense ‘trite or conventional remark’ that has caught on. Bromide was based on bromine [19], the name of a liquid element, which in turn was formed from French brome. The element was so christened, from Greek brōmos ‘stench’, because of its highly irritant and unpleasant smell.
bromide (n.)youdaoicibaDictYouDict
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.