Walpurgisnacht

noun

Wal·​pur·​gis·​nacht väl-ˈpu̇r-gəs-ˌnäḵt 

: the eve of May Day on which witches are held to ride to an appointed rendezvous : walpurgis night

The place was San Francisco, the year 1966, the date April 30—Walpurgisnacht, the highest holiday on the Satanic calendar.

—Marc Weingarten

Word History

Etymology

German

First Known Use

1822, in the meaning defined above