noun Etymology: short for Middle English Alholowmesse, from Old English ealra halgena mæsse, literally, all saints' mass Date: 14th century All Saints' Day
HALLOWMAS
Meaning of HALLOWMAS in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012