DIURNAL

adj. daily, of the day; of the daytime; active during the day (i.e. animals)

Diurnal ("daily") may refer to:Diurnal animal, a plant or animal that is active in the daytimeActions which are completed in 24 hours and are repeated every 24 hours, e.g. the sun reaching its zenith.Diurnal motion, the apparent motion of stars around the Earth, caused by the Earth's rotation around its axis. More generally it means repeating daily as in e.g. diurnal effectDiurnal phase shift, the phase shift of electromagnetic signals associated with daily changes in the ionosphereDiurnal temperature variation, the daily temperature shift that occurs from daytime to night
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Adjective
1. 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"
(antonym) nocturnal
(see-also) daytime
(classification) biology, biological science
2. having a daily cycle or occurring every day; "diurnal rhythms"; "diurnal rotation of the heavens"; "the diurnal slumber of bats"
(similar) cyclic, cyclical

adj. diurnal, daily, active during the day (i.e. animals)

(a.)
Relating to the daytime; belonging to the period of daylight, distinguished from the night; -- opposed to nocturnal; as, diurnal heat; diurnal hours.
  

(a.)
Opening during the day, and closing at night; -- said of flowers or leaves.
  

(a.)
Daily; recurring every day; performed in a day; going through its changes in a day; constituting the measure of a day; as, a diurnal fever; a diurnal task; diurnal aberration, or diurnal parallax; the diurnal revolution of the earth.
  

(a.)
Active by day; -- applied especially to the eagles and hawks among raptorial birds, and to butterflies (Diurna) among insects.
  

(a.)
A small volume containing the daily service for the "little hours," viz., prime, tierce, sext, nones, vespers, and compline.
  

(a.)
A diurnal bird or insect.
  

(a.)
A daybook; a journal.