1.  bromide(n = noun.substance) - any of the salts of hydrobromic acid; formerly used as a sedative but now generally replaced by safer drugs;
is a kind of halide
has particulars: hydrogen bromide, methyl bromide, silver bromide

2.  bromide(n = noun.communication) banality, cliche, commonplace, platitude - a trite or obvious remark;
is a kind of comment, input, remark, truism

1.  A compound of bromine with a positive radical. [1913 Webster]

2.  A person who is conventional and commonplace in his habits of thought and conversation. [Webster 1913 Suppl.]
"The bromide conforms to everything sanctioned by the majority, and may be depended upon to be trite, banal, and arbitrary." [Webster 1913 Suppl.]

3.  a conventional or trite saying; -- often used in the phrase “old bromide”. [PJC]

bromide, n.
1 Chem. any binary compound of bromine.
2 Pharm. a preparation of usu. potassium bromide, used as a sedative.
3 a trite remark.

Idiom:
bromide paper a photographic printing paper coated with silver bromide emulsion.

bromide paper, hydrogen bromide, ipratropium bromide, methyl bromide, potassium bromide, silver bromide