half-blood prince
"1) "hey, have you read [harry potter] and the half-blood prince yet?"  2) "can you believe (blank) was revealed to be the half-blood prince?""
the half-blood prince (hpb) is:  1) the sixth of seven planned installments in the [harry potter] series of books
""1) "hey, have you read [harry potter] and the half-blood prince yet?"  2) "can you believe (blank) was revealed to be the half-blood prince?""" What is the definition of "half-blood prince"?