2 expected high and low levels of a substance during a 24-hour period. 17 synonyms of diurnal from the Merriam-Webster Thesaurus, plus 47 related words, definitions, and antonyms. Learn more. diurnal: [ di-er´nal ] pertaining to or occurring during the daytime, or period of light. Definition of Diurnal Of or belonging to the day: as the apparent diurnal motion of the planets resulting from the axial rotation of the Earth (v. Motion). Scientifically classifying diurnality within animals can be a ⦠diurnal variation: 1 the variability of output or excretion of a substance during the day versus the night or over a 12-hour interval. anon345206 August 16, 2013 . Motion). (adjective) Diurnal describes birds and other animals that are principally active during the day with all major life activities, including courtship, nesting, feeding, preening, and other behaviors.Most species of birds, including songbirds, hummingbirds, and waterfowl are considered diurnal. The diurnal model creates a diurnal pattern from flow data using all of the data or a user-defined subset of the data. nocturnal definition: 1. being active or happening at night rather than during the day: 2. of the night, or relating toâ¦. Diurnal: occurring, done, produced, or appearing every day. anon357743 December 6, 2013 . Find more ways to say diurnal, along with related words, antonyms and example phrases at Thesaurus.com, the ⦠An animal that shows diurnal and nocturnal behavior is classified as cathemeral. Another word for diurnal. For example, blood cortisol is highest in the morning and lowest in the early evening. Many types of animals are classified as being diurnal, meaning they are active during the day time and inactive or have periods of rest during the night time. Find another word for diurnal. Most people chose this as the best definition of diurnal: The definition of diurnal... See the dictionary meaning, pronunciation, and sentence examples. Psychology Definition of DIURNAL: Means daily or recurring every 24 hours and active during daylight. What does crepuscular mean -- that they hunt in the day and night? Medical Author: William C. Shiel Jr., MD, FACP, FACR; Diurnal: Occurring in the daytime. home / medterms medical dictionary a-z list / diurnal definition Medical Definition of Diurnal. Diurnal also refers to something that recurs every day. D. Arc: Measurement, in degrees, of the arc a celestial body traverses from its ⦠What Does Diurnal Mean? See biological clock- ⦠A patient may have a diurnal fever rather than a nocturnal one. The diurnal model is useful for the following functions: Scrubbing meter data and comparing it to the typical diurnal pattern to detect changes in system operation. Most primates are diurnal. Commonly classified diurnal animals include mammals, birds, and reptiles. 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