noun Etymology: Middle English Whitsonday, from Old English hwīta sunnandæg, literally, white Sunday; probably from the custom of wearing white robes by those newly baptized at this season Date: 12th century Pentecost 2
WHITSUNDAY
Meaning of WHITSUNDAY in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012