Fanac is a
fan slang term (constructed from FANnish ACtivities) for activities within the realm of
science fiction fandom. It has also been used as a title for at least two
science fiction fanzines, one published by
Terry Carr and
Ron Ellik, and later continued by
Walter H. Breen, in the late 1950s through early 1960s; and the other published by
Swedish fan
John-Henri Holmberg from 1963 to 1994.