(esp. in medieval German folklore) the evening preceding the feast day of St. Walpurgis, when witches congregated, esp. on the Brocken. German, Walpurgisnacht /vahl poordd"gis nahkht'/ .
WALPURGIS NIGHT
Meaning of WALPURGIS NIGHT in English
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012