(in Irish folklore) a spirit in the form of a wailing woman who appears to or is heard by members of a family as a sign that one of them is about to die.
Also, banshie.
Origin: 1765–75; < Ir bean sīdhe woman of a fairy mound; see sídh
ban·shee also ban·shie (bān'shē) n. A female spirit in Gaelic folklore believed to presage, by wailing, a death in a family.
[Irish Gaelic bean sídhe, woman of the fairies, banshee : bean, woman (from Old Irish ben; see gwen- in Indo-European roots) + sídhe, fairy (from Old Irish síde, genitive of síd, fairy mound; see sed- in Indo-European roots).]