Another new word

A bromide ion is a bromine atom with charge of −1.

Compounds with bromine in formal oxidation state −1 are called bromides. This can include ionic compounds such as caesium bromide or covalent compounds such as sulfur dibromide.

Bromide compounds, especially potassium bromide, were frequently used as sedatives in the 19th and early 20th century. This gave the word "bromide" its colloquial connotation of a boring cliché, a bit of conventional wisdom overused as a sedative.