Bromide
Bromide ({not transcribed}) , noun
1.
(Chemistry) A compound of bromine with a positive radical.
2.
A person who is conventional and commonplace in his habits of thought and conversation. [Slang]
The bromide conforms to everything sanctioned by the majority, and may be depended upon to be trite, banal, and arbitrary.
3.
a conventional or trite saying; -- often used in the phrase “old bromide”.