banshee, (“woman of the fairies”) supernatural being in Irish and other Celtic folklore whose mournful “keening,” or wailing screaming or lamentation, at night was believed to foretell the death of a member of the family of the person who heard the spirit. In Ireland banshees were believed to warn only families of pure Irish descent. The Welsh counterpart, the gwrach y Rhibyn (“witch of Rhibyn”), visited only families of old Welsh stock.

The Scottish novelist Sir Walter Scott mentioned belief in a kind of banshee or household spirit in certain Highland families (Letters on Demonology and Witchcraft, 1830).