Definition of ephialtes in English:

ephialtes

noun

rare
  • A nightmare.

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

Origin

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

Pronunciation:

ephialtes

/ɛfɪˈaltiːz/