Hmmm......
Not sure I agree completely with blueplume.
I see what you are saying, but I had the impression that the_bookkeeper was asking about a more technical description to resolve some confusion that he may have had.
A 'base turn' may be part of a published procedure, as in my first link. However, it is true that some ATC units and pilots refer to a generic 'procedure turn' to cover both types. Still, a bit like the use of the generic term 'height' when we really mean 'altitude', it doesn't really matter as long as everyone knows what they (and the other fellow) are doing and thinking!