Here's one for you:

My dentist, who enjoys learning, mentioned today that he'd come across a term that dated back to 1918 that he had never come across: electrozone. In an old dentistry text, it was noted that 'electrozone' was an ingredient that could remove malodorous scents from crowns. Problem is: my dentist had no idea what electrozone might have been--and Google hadn't helped me a bit. I assured him that someone here would ferret out electrozone. He did mention that 'zone' is related in chemistry to oxygen--and he suspected that electrozone might have been a kind of peroxide.

Any takers?