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1. (adj.) diurnal
occurring each day; daily.
2. diurnal
of or belonging to the daytime.
3. diurnal
occurring in daily cycles:
the apparent diurnal motion of celestial bodies.
4. diurnal
active by day, as certain birds and insects
5. diurnal
opening by day and closing by night, as certain flowers.
6. (n.) diurnal
Archaic.
7. diurnal
Archaic.
Etymology: (1400–50; late ME < L diurnālis <diurn(us) daily)
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| Definition of 'diurnal' |
Princeton's WordNet |
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1. (adj) 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"
2. (adj) diurnal
having a daily cycle or occurring every day
"diurnal rotation of the heavens"
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| Definition of 'diurnal' |
Webster Dictionary |
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1. (adj) diurnal
relating to the daytime; belonging to the period of daylight, distinguished from the night; -- opposed to nocturnal; as, diurnal heat; diurnal hours
2. (adj) diurnal
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
3. (adj) diurnal
opening during the day, and closing at night; -- said of flowers or leaves
4. (adj) diurnal
active by day; -- applied especially to the eagles and hawks among raptorial birds, and to butterflies (Diurna) among insects
5. (adj) diurnal
a daybook; a journal
6. (adj) diurnal
a small volume containing the daily service for the "little hours," viz., prime, tierce, sext, nones, vespers, and compline
7. (adj) diurnal
a diurnal bird or insect
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Definitions of diurnal 
