1. Chemistry.
    1. a salt of hydrobromic acid consisting of two elements, one of which is bromine, as sodium bromide, NaBr.
    2. a compound containing bromine, as methyl bromide.
  2. Pharmacology. potassium bromide, known to produce central nervous system depression, formerly used as a sedative.
  3. a platitude or trite saying.
  4. a person who is platitudinous and boring.


  1. any salt of hydrobromic acid, containing the monovalent ion Br (bromide ion)
  2. any compound containing a bromine atom, such as methyl bromide
  3. a dose of sodium or potassium bromide given as a sedative
    1. a trite saying; platitude
    2. a dull or boring person

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.


  1. A binary compound of bromine with another element, especially a salt containing monovalent negatively charged bromine.
  2. Potassium bromide.

  1. A compound, such as potassium bromide, containing bromine and another element or radical.

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