horcrux
Noun
Meaning
In the Harry Potter series, an object in which a wizard has concealed a part of their soul through magic, rendering them immortal until the object is irreparably damaged or destroyed.
Synonym: phylactery (general fantasy)
(by extension) Something in which one has invested a part of one's self; an object which allows for the preservation of memory, culture, etc.
Horcrux (plural Horcruxes)
Alternative letter-case form of horcrux.
Examples
He is the one, in fact, who realizes that the Basilisk fang is a potential weapon against a Horcrux, and finishes the job right as everyone else is about to be consumed by the ravaging Fiendfyre.
By the end of the book, Dumbledore and Harry set out to the cave where Dumbledore believes a Horcrux resides.
The progress from one horcrux to another is still entertaining, particularly Harry's self-sacrifice to Voldemort in the woods.
The Muggle world is buzzing over the biggest since we all found out that Harry was a horcrux.
She, Harry, and Ron join Dumbledore's Army in the Battle of Hogwarts, during which Hermione destroys Hufflepuff's cup in the Chamber of Secrets with a basilisk fang, eliminating another Horcrux.
They find a basilisk fang to use to destroy the Horcrux made from Helga Hufflepuff's cup.