noun Psychiatry.
an abnormal fear of night or darkness.

nycto- + -phobia Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
nyctophobia (ˌnɪktəʊˈfəʊbɪə)
psychiatry an abnormal dread of night or darkness
[nyct-, from Greek nukt-, nux night + -phobia]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Main Entry:  nyctophobia
Part of Speech:  n
Definition:  a fear of night, darkness; also called noctiphobia
Etymology:  nycto- 'night'
Main Entry:  nyctophobia
Part of Speech:  n
Definition:  See noctiphobia's 21st Century Lexicon
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American Heritage
Medical Dictionary

nyctophobia nyc·to·pho·bi·a (nĭk'tə-fō'bē-ə)
An abnormal fear of night or of the dark. Also called scotophobia.

The American Heritage® Stedman's Medical Dictionary
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