An episode or a situation having the quality of nightmarish wildness.
(gmc. folklore) April 30, the eve of May Day, when witches supposedly gathered on Brocken mountain for a demonic orgy.
Origin of walpurgis-night
- Partial translation of German Walpurgisnacht Walpurgis , Saint Walpurga (died 779) Nacht night
From American Heritage Dictionary of the English Language, 5th Edition