[sab.bat] n, often cap [F, lit., sabbath, fr. L sabbatum] (1652): a midnight assembly of diabolists (as witches and sorcerers) held esp. in medieval and Renaissance times to renew allegiance to the devil through mystic rites and orgies
SABBAT
Meaning of SABBAT in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012