Etymology
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bromide (n.)

compound of bromine and another metal or radical, 1836, from bromine, the pungent, poisonous element, + -ide. Used medicinally as a sedative; figurative sense of "dull, conventional person or trite saying" popularized by U.S. humorist Frank Gelett Burgess in his book "Are You a Bromide?" (1906). Related: Bromidic.

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Definitions of bromide

bromide (n.)
any of the salts of hydrobromic acid; formerly used as a sedative but now generally replaced by safer drugs;
bromide (n.)
a trite or obvious remark;
From wordnet.princeton.edu