Definition from Wiktionary, the free dictionary
banshee (plural banshees)
- In Irish folklore, a female spirit, usually taking the form of a woman whose mournful wailing warns of an impending death. Originally a fairy woman singing a caoineadh (lament) for recently-deceased members of the O’Grady, the O’Neill, the O’Brien, the O’Connor, and the Kavanagh families, translations into English made a distinction between the banshee and other fairy folk that the original language and original stories do not seem to have, and thus the current image of the banshee.
in Irish folklore, a female spirit