Definition of ephialtes in English:

ephialtes

Line breaks: ephi|al¦tes
Pronunciation: /ɛfɪˈaltiːz/

Entry from British & World English dictionary

noun (plural same)

rare
A nightmare.

Origin

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

Definition of ephialtes in:

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Word of the day neoteny
Pronunciation: nēˈätn-ē
noun
retention of juvenile features in the adult animal