Definition of nyctogenous in English:

nyctogenous

Syllabification: nyc·tog·e·nous
Pronunciation: /nikˈtäjənəs
 
/

adjective

(Of symptoms or behavior) occurring or demonstrated only in the night or in darkness: nyctogenous bouts of anxiety

Origin

early 20th century: from Greek nux, nukt- 'night' + -genous.

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