Bromic is an uncommon word that describes something that is related to bromine, a chemical element. There aren't many synonyms for bromic that are commonly used, but a few options are available. For example, you might use the word bromous instead, which also refers to bromine in some way. Alternatively, you could use the more general term halogenated, which can refer to any chemical compound that contains a halogen element like bromine. Other words that might be considered synonyms for bromic include brominated, bromy, and bromidic, but these terms may not be as accurate or specific to bromine as the other options mentioned.