well, I can't agree with you guys on that one...
Just to make sure I wasn't imagining this I looked it up on page 528 of the Dictionary of Aeronautical Terms, which defines turbosupercharger as "The original name for a turbocharger" as the only definition.
and from the American Heritage Dictionary
Now arguing dictionary semantics won't help us here, but consider doing a search on your favorite search engine and look at the context that turbosupercharger is used in. In 100% of the aviation related pages I looked at, none used the context that I refer to as a turbo/blown configuration...
Here is a bit more of my background for turbo/blown configurations. Detroit Diesel engines are 2 stroke diesels which RELY on supercharging to operate. The blowers are gear driven, and each bank uses a rather large turbo. These engines have a blower bypass that allows the turbocharged air to bypass the blowers because it can supply more air without the positive displacement blowers in the way... So at high RPMS only the turbos supply the air. I am not a powerplant mechanic and I don't have any real experience with the internals of big radial so can't offer a truly definitive answer in this situation.
If this is only something that was 'described to me' I might wonder about it's validity. I can think of a few things that have been propagated by misinformed instructors in my life. Let me know what you decide if you dig into it.
document from General Electric, 1943
At the present time, turbosuperchargers are used in series with geared superchargers, the intercooler and carburetor being located between them. In this way, maximum use can be made of the advantages of each type.
From this, I understand why this might cause confusion, but notice that they too differentiate from geared superchargers and turbosuperchargers, but they never use the term turbocharger in the document. This says that they were used in conjuction with the geared variant, which leads me too believe that someone just grouped the two together in error at some point. It's all semantics and open to interpretation, but interesting reading nonetheless.
Also note the figure 11
"Cutaway Turbosupercharger" at section 9.a. which clearly shows only what we know as a turbocharger...