Horcruxcrux

Horcruxcrux: noun. The important part of a horcrux, which actually contains the part of someone's soul/living essence. Taking a real-world example, when Voldemort used the locket that formerly belonged to Salazar Slytherin, it was only the inside of the locket that contained the actual horcrux, and thus the inside of the locket was the horcruxcrux.