I don't think it was ever a technical term. A technical term would be something like "Mongoloid Idiot". That was considered pejorative, so it became "Down's Sy

I don't think it was ever a technical term. A technical term would be something like "Mongoloid Idiot". That was considered pejorative, so it became "Down's Syndrome". Then it became "Down Syndrome", because Dr Down did not actually have the condition.