Okay... you seem to have gotten the wrong idea. I wasn't trying to correct your use of the word carboy. I was simply trying to help you and joeybeer out.
Your mutual fascination with the vessel (both quotes provided below, unedited and in full), indicated that neither of you were very familiar with 15gal/57L demijohns, since much like carboys, they're pretty much all identical, and if you've seen one, you've seen them all. So I figured one or both of you guys might appreciate a bit more info on them.
And because HBT posters and even homebrew stores virtually always refer to these particular vessels as demijohns, (to differentiate them from the smaller/cylindrical "carboys", as your Wikipedia link pointed out), I specifically called it a demijohn as well, because it is much more useful to anybody interested in more information on them or possibly even buying one.
So yeah... I really wasn't being pedantic in the least, and I apologize for apparently not being clear enough. My ONLY intention was to provide a helpful starting point for you guys, considering the posts you made (quoted below).