臭 chòu
“smell, stink, emit foul odor”
On its own, an ordinary character; Cantonese cau3. Readings and gloss from the Unicode Unihan database.
Carries Bromine
Transliterates syllable 1 of bro·mi·ne: bromine → xiù.
The reading drifted: the component is read chòu, the element xiù.