Half Blood Prince vs. Half-Blood Prince or Halfblood Prince

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No: HPFGUIDX 105197

Another professional wordsmith and I were bitching together about the huge, GIGANTIC 
style faux-pas in JKR's announced title for book six. Strictly speaking, whether the style is 
British or American, a two word noun phrase that's used as an adjective (that is, that 
modifies a noun) is hyphenated. Not to mention the fact that, in all of the previous books, 
even the noun form of 'half-blood' is always hyphenated. In CoS (I apologize--we had this 
conversation a week ago, and I don't have the book in front of me), Hagrid says that most 
wizards are "half-bloods or less" and Tom Riddle refers twice to himself (and once to 
Harry) as a "half-blood."

So, the title should, strictly speaking, be Harry Potter and the Half-Blood Prince.

UNLESS....

UNLESS she doesn't mean a prince who is a half-blood.

What the other meaning of Half Blood Prince could be, I am unsure. But could she have a 
different meaning altogether? Is there such a thing as a Blood Prince? There is the phrase, 
"a prince of the blood," meaning of the royal family. Can anyone out there come up with 
something else? 

PERHAPS....

The prince in question is half-vampire? (Dear me, I really don't wish to restart Vampire!
Snape threads, even as JKR has fairly emphatically shut them down....)