Beltane
an ancient Celtic festival observed on May Day in Scotland and Ireland to mark the beginning of summer.
Historical Examples
    Folk Lore James Napier
    Encyclopaedia Britannica, 11th Edition, Volume 3, Slice 5 Various
    Studies in the Psychology of Sex, Volume 1 (of 6) Havelock Ellis
    Balder The Beautiful, Vol. I. Sir James George Frazer
    The Religion of the Ancient Celts J. A. MacCulloch
    Encyclopaedia Britannica, 11th Edition, Volume 3, Slice 5 Various
    Encyclopaedia Britannica, 11th Edition, Volume 3, Slice 5 Various
    Balder The Beautiful, Vol. I. Sir James George Frazer
    Nooks and Corners of English Life, Past and Present John Timbs
    Folk Lore James Napier
noun
an ancient Celtic festival with a sacrificial bonfire on May Day. It is also celebrated by modern pagans
n.
The rubbish about Baal, Bel, Belus imported into the word from the Old Testament and classical antiquity, is outside the scope of scientific etymology. [OED]
Also known as “Old May Day,” because after the 1752 calendar reform it continued to be reckoned according to Old Style; it was one of the quarter-days of ancient Scotland.
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