(Μορμώ), a female spectre, with which the Greeks used to frighten little children. (Aristoph. Ach. 582, Pax, 474.) Mormo was one of the same class of bugbears as Empusa and Lamia.
[L.S]A Dictionary of Greek and Roman biography and mythology
Smith, William
A Dictionary of Greek and Roman biography and mythology. William Smith, LLD, ed. 1890