ban ‧ shee /ˈbænʃiː/ BrE AmE noun [countable]
[ Date: 1600-1700 ; Language: Scottish Gaelic ; Origin: bean-sith , probably from Old Irish ben side 'woman of fairyland' ]
a female ↑ spirit whose loud cry is believed to be heard when someone is going to die:
She was screaming like a banshee.