Synonyms Word Origin of or relating to the night (opposed to diurnal). done, occurring, or coming at night: nocturnal visit. active at night (opposed to diurnal): nocturnal animals. opening by night and closing by day, as certain flowers (opposed to diurnal). . Archaic an astrolabe for telling time at night or for determining latitude by the position of certain stars in reference to Polaris. Origin of nocturnal
dating back to
-al 1 Related forms noc·tur·nal·i·ty, noun noc·tur·nal·ly, adverb non·noc·tur·nal, adjective non·noc·tur·nal·ly, adverb sem·i·noc·tur·nal, adjective un·noc·tur·nal, adjective un·noc·tur·nal·ly, adverb
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for non-nocturnal of, used during, occurring in, or relating to the night (of animals) active at night (of plants) having flowers that open at night and close by day Derived Forms nocturnality, noun nocturnally, adverb Word Origin for nocturnal
C15: from Late Latin
nocturnālis, from Latin nox night
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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Word Origin and History for non-nocturnal adj.
late 15c., from Old French
nocturnal "nightly, nocturnal," or directly from Late Latin nocturnalis, from Latin nocturnus "belonging to the night," from nox (genitive noctis) "night," cognate with Old English neaht (see night) + -urnus, suffix forming adjectives of time. Nocturnal emission "involuntary ejaculation during sleep" first recorded 1813.
Online Etymology Dictionary, © 2010 Douglas Harper
non-nocturnal in Medicine Of, relating to, or occurring in the night. Most active at night.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Occurring at night. Most active at night. Many animals, such as owls and bats, are nocturnal. Having flowers that open during the night and close at daylight. Nocturnal plants are often pollinated by moths. Compare diurnal.
The American Heritage® Science Dictionary
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