(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, ban·shie.
Origin: 1765–75; < Irish bean sīdhe woman of a fairy mound; see sídh
1771, from phonetic spelling of Ir. bean sidhe "female of the Elves," from bean "woman" (from PIE span class="foreign">*gwen-; see queen) + sidhe, from sith "fairy" or sid "fairy mound." Specifically, one who calls to the spirits of the dead.