noun (plural same)rare
- Ephialtes could apparently manifest as both erotic and nonerotic nightmares.
- 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.
Early 17th century: Greek ephialtēs, possibly from ephiallesthai 'leap on'.
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