You are correct that they aren't medical doctors. They're still technically doctors though, if they've completed chiropractic school and are certified. It's the highest degree in that field, so that's technically a doctorate. Similar to academic doctorates, or how technically lawyers have a doctorate, it's just a law doctorate (Dr in something that is abbreviated as JD, I forget). But it doesn't make sense to call them doctors. I fall on the side that chiropractors shouldn't be referred to as Dr day to day, even though they have a doctorate. I still do think that chiropractors can be useful in certain situations though. I've had some things fixed with a chiropractor that other options didn't fix.