di·ur·nal

(dī-ûr′nəl)

adj.

1. Relating to or occurring in a 24-hour period; daily.

2. Occurring or active during the daytime rather than at night: diurnal animals.

3. Botany Opening during daylight hours and closing at night.

1. A book containing all the offices for the daily canonical hours of prayer except matins.

2. Archaic

a. A diary or journal.

b. A daily newspaper.

[Middle English, from Late Latin diurnālis, from Latin diurnus, from diēs, day; see dyeu- in Indo-European roots.]

di·ur′nal·ly adv.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

diurnal

(daɪˈɜːnəl)

adj

1. happening during the day or daily

2. (Botany) (of flowers) open during the day and closed at night

3. (Zoology) (of animals) active during the day. Compare nocturnal

(Roman Catholic Church) a service book containing all the canonical hours except matins

[C15: from Late Latin diurnālis, from Latin diurnus, from diēs day]

diˈurnally adv

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

di•ur•nal

(daɪˈɜr nl)

adj.

1. occurring each day; daily.

2. of or belonging to the daytime.

3. occurring in daily cycles: the apparent diurnal motion of celestial bodies.

4. active by day, as certain birds and insects (opposed to nocturnal).

5. opening by day and closing by night, as certain flowers.

6. Archaic. diary.

7. Archaic. newspaper.

[1400–50; late Middle English < Latin diurnālis <diurn(us) daily]

di•ur′nal•ly, adv.

di·ur·nal

(dī-ûr′nəl)

1. Occurring in a 24-hour period; daily.

2. Most active during the daytime. Many animals, including the apes, are diurnal. Compare nocturnal.

3. Having leaves or flowers that open in daylight and close at night. The morning glory and crocus are diurnal.

The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

ThesaurusAntonymsRelated WordsSynonymsLegend:

Adj.	1.	diurnal - of or belonging to or active during the day; "diurnal animals are active during the day"; "diurnal flowers are open during the day and closed at night"; "diurnal and nocturnal offices" biological science, biology - the science that studies living organisms nocturnal - belonging to or active during the night; "nocturnal animals are active at night"; "nocturnal plants have flowers that open at night and close by day"
	2.	diurnal - having a daily cycle or occurring every day; "diurnal rotation of the heavens" periodic, periodical - happening or recurring at regular intervals; "the periodic appearance of the seventeen-year locust"

diurnal

adjective

1. daytime, active during the day, non-nocturnal Kangaroos are diurnal animals

2. daily, regular, everyday, circadian, quotidian the diurnal life of monasteries

Collins Thesaurus of the English Language – Complete and Unabridged 2nd Edition. 2002 © HarperCollins Publishers 1995, 2002

Translations

denní

täglich

diurno

avaavadiurnaalinenjokapäiväinenkukkapäivä

diurne journalier quotidien

napinappali

diurno

dagelijks

дневной ежедневный

diurnal

[daɪˈɜːnl] ADJ → diurno

Collins Spanish Dictionary - Complete and Unabridged 8th Edition 2005 © William Collins Sons & Co. Ltd. 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005

diurnal

[daɪˈɜː^rn^əl] adj (formal) → diurne

Collins English/French Electronic Resource. © HarperCollins Publishers 2005

diurnal

adj (liter: = of the daytime) → Tages-; the earth’s diurnal rotation → die tägliche Umdrehung der Erde

n (Eccl) → Diurnal(e) nt

Collins German Dictionary – Complete and Unabridged 7th Edition 2005. © William Collins Sons & Co. Ltd. 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004, 2005, 2007

Mentioned in

References in periodicals archive

All three assays exhibited similar diurnal rhythm, with peak excretion between 0400 to 0700 and a nadir between 1300 to 1600.

Comparison of analytical performance and biological variability of three bone resorption assays

Behavioral time budget and diurnal rhythm of white-headed duck in Northwest China.

Time Budget and Activity Rhythm of the Mandarin Duck Aix galericulata in the Poyang Lake Watershed

A graphic representation of the diurnal rhythm of salivary cortisol is then produced and compared to a normal rhythm in healthy individuals.

Adrenal Fatigue: Myth or Metaphor?

The team first measured the diurnal rhythm of salivary cortisol levels from the volunteers and then exposed one group to stress test in the morning, and another to the evening.

Your body may not cope with evening stress: Study

To visualize the diurnal rhythm of cystatin C, 24-h concentration curves were fitted for both study groups using cosinor rhythmometry.

Biological Variation of Creatinine, Cystatin C, and eGFR over 24 Hours

(1990), the diurnal C[H.sub.4] emission rhythm may increase with the increasing diurnal rhythm of root exudates, resulting in higher apparent activation energy ([E.sub.a]).

Diurnal variation of methane emission from a paddy field in Brazilian Southeast/Variacao diurna da emissao de metano em arroz irrigado no Sudeste do Brasil

It has been reported that Glast (glutamate/aspartate transporter) expression and protein levels within the SCN present a diurnal rhythm in a light/dark (12/12h) cycle [31].

The Role of Mammalian Glial Cells in Circadian Rhythm Regulation

A disruption of the diurnal rhythm of cortisol causes fatigue, depression, ill health, and insulin resistance.

Potential of Cocoa Pod Husk Pectin-Based Modified Release Capsules as a Carrier for Chronodelivery of Hydrocortisone in Sprague-Dawley Rats

Collection of twelve-hour urine samples allowed for assessment of diurnal rhythm but not the precise timing for 6-SMT excretion.

Melatonin Secretion Pattern in Critically 111 Patients: A Pilot Descriptive Study

Reassessment of glucose diurnal rhythm revealed that her plasma glucose level was 59-83 mg/dL during the intake of 10 mg of hydrocortisone (Table 3(a)).

Asymptomatic Congenital Hyperinsulinism due to a Glucokinase-Activating Mutation, Treated as Adrenal Insufficiency for Twelve Years

The endocrinologist explained that this reverse habit fractures the body's diurnal rhythm or the body's sleep-wake cycles, which causes the body to suffer a lot of stress.

6M Pinoys have diabetes