Definition of Old Nick in English:

Old Nick

Syllabification: Old Nick
Pronunciation: /ˌōld ˈnik
 
/
An informal name for the Devil.

Origin

mid 17th century: probably from a nickname for the given name Nicholas.

Definition of Old Nick in:

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Word of the day neoteny
Pronunciation: niːˈɒt(ə)ni
noun
retention of juvenile features in the adult animal