Definition of "apotropaic"

A boring subtext, about the wisdom or otherwise of actually uttering Voldemort's name, meanwhile robs the apotropaic device of its force.

2007 August 12, Christopher Hitchens, “Harry Potter: The Boy Who Lived”, in New York Times‎

In earlier generations scholars reacted by removing many of these objects from public view, putting them in the ‘Secret Cabinet’ of the museum at Naples or otherwise under wraps. […] More recently the fashion has been to deflect attention from their sexuality by referring to them as ‘magical’, ‘apotropaic’ or ‘averters of the evil eye’.

2010, Mary Beard, chapter 7, in Pompeii: The Life of a Roman Town