Definition of mormo in English:

mormo

noun

rare, historical
  • An imaginary monster, especially one invoked to frighten children; a hobgoblin.

Origin

Early 17th century. From ancient Greek μορμώ a hideous female monster (also as proper noun, and as an exclamation to frighten children), perhaps cognate with classical Latin formīdāre.

Pronunciation

mormo

/ˈmɔːməʊ/