Definition of ephialtes in English:

ephialtes

noun

rare
  • A nightmare.

    • ‘Ephialtes could apparently manifest as both erotic and nonerotic nightmares.’
    • ‘The ephialtes, or nightmare, is called by the common people witch-riding.’
    • ‘The influential Greek physician Galen examined the causation of the nightmare or ephialtes during the second century AD.’
    • ‘To prevent the Ephialtes or night-mare we hang up a hollow stone in our stables.’
    • ‘The black seed also taken before bedtime, is very effectual for such as in their sleep are troubled with the disease called Ephialtes.’
    bad dream, night terrors
    View synonyms

Origin

Early 17th century: Greek ephialtēs, possibly from ephiallesthai leap on.

Pronunciation:

ephialtes

/ɛfɪˈaltiːz/