[ nik-tuh-foh-bee-uh ]
/ ˌnɪk təˈfoʊ bi ə /

noun Psychiatry.

an irrational or disproportionate fear of night or nighttime darkness: My nyctophobia is debilitating during the short days and long nights of winter.
Compare scotophobia.

Origin of nyctophobia

First recorded in 1890–95; nycto- + -phobia

Words nearby nyctophobia Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for nyctophobia

/ (ˌnɪktəʊˈfəʊbɪə) /


psychiatry an abnormal dread of night or darkness

Derived forms of nyctophobia

nyctophobic, adjective

Word Origin for nyctophobia

nyct-, from Greek nukt-, nux night + -phobia
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for nyctophobia

[ nĭk′tə-fōbē-ə ]


An abnormal fear of night or of the dark.scotophobia
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.