lycanthropy
Lycanthropy (noun) means the state of being a lycanthrope (or werewolf), a person who can shapeshift between the form of a human being and a wolf, often said to happen involuntarily during a full moon; werewolfdom.
Etymology
Borrowed from Ancient Greek λῠκᾰνθρωπῐ́ᾱ (lŭkănthrōpĭ́ā), from λῠκᾰ́νθρωπος (lŭkắnthrōpos, “wolfman”). By surface analysis, it breaks down as lycanthrope plus -y (abstract noun suffix).