diurnal

adjective
di·​ur·​nal | \ dī-ˈər-nᵊl How to pronounce diurnal (audio) \

Definition of diurnal

 (Entry 1 of 2)

1a biology : active chiefly in the daytime diurnal animals
b : of, relating to, or occurring in the daytime the city's diurnal noises
c botany : opening during the day and closing at night diurnal flowers
2a : recurring every day diurnal tasks
b : having a daily cycle diurnal tides

diurnal

noun

Definition of diurnal (Entry 2 of 2)

2 archaic : diary, daybook

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Other Words from diurnal

Adjective

diurnally \ dī-​ˈər-​nᵊl-​ē How to pronounce diurnal (audio) \ adverb

Examples of diurnal in a Sentence

Adjective a love as constant and certain as the diurnal tides Noun a microfilm containing a collection of diurnals published by 19th-century American abolitionists
Recent Examples on the Web: Adjective Measurements are taken in the morning, afternoon and evening to accurately capture the diurnal warming of a city. Haley Brink And Derek Van Dam, CNN, 2 June 2021 The diurnal vertical migration includes trillions of tiny animals, many in the larval stage, that rise from depths of 1,000 feet or more to just beneath the surface to feed. Erik Olsen New York Times, Star Tribune, 15 Apr. 2021 The diurnal vertical migration includes trillions of tiny animals, many in the larval stage, that rise from great depths of 1,000 feet or more to just beneath the surface to feed. New York Times, 30 Mar. 2021 In the past year, that emphasis on diurnal rhythms has become pertinent in a way that Rountree could not have anticipated. Alex Ross, The New Yorker, 22 Feb. 2021 Other plants perform a similar diurnal dance, including agriculturally important crops such as soybeans, cotton and alfalfa. Heidi Ledford, Scientific American, 15 July 2014 The first is the basic diurnal nature of renewable generation—solar doesn’t generate at night, after all, and wind generation is often low midday. Nathaniel Bullard, Bloomberg.com, 8 June 2020 Our song bird species are diurnal (daytime) feeders and eat insects that are active during the day. oregonlive, 6 June 2020 This diurnal pattern is also seen on Mars—something scientists weren’t expecting to detect from the surface. National Geographic, 24 Feb. 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'diurnal.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of diurnal

Adjective

14th century, in the meaning defined at sense 2a

Noun

1600, in the meaning defined at sense 2

History and Etymology for diurnal

Adjective

Middle English, from Latin diurnalis — more at journal

Noun

derivative of diurnal entry 1

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Time Traveler for diurnal

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The first known use of diurnal was in the 14th century

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Last Updated

7 Jun 2021

Cite this Entry

“Diurnal.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/diurnal. Accessed 17 Jun. 2021.

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More Definitions for diurnal

diurnal

adjective

English Language Learners Definition of diurnal

technical
: active mainly during the day
: happening every day

diurnal

adjective
di·​ur·​nal | \ dī-ˈərn-ᵊl How to pronounce diurnal (audio) \

Medical Definition of diurnal

1 : having a daily cycle diurnal rhythms
2a : of, relating to, or occurring in the daytime diurnal activity
b : chiefly active during the daytime diurnal mosquitoes

Other Words from diurnal

diurnally \ -​ᵊl-​ē How to pronounce diurnal (audio) \ adverb

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