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1. Occurring, or taking place at daytime.

2. Active during daylight hours.

3. Reoccurring in the day, or daily.
As oppose to Nocturnal animals that are active at night some animals are Diurnal only becoming active in the day.
Diurnal by NotKnownToYou April 3, 2009
Related Words
To be active or awake during the day.

Antonym of nocturnal
I am diurnal
Diurnal by The Gadd July 29, 2011

Scatalogically Similar: Diurnal Discrepancy 

The way you can say "Same Shit: Different Day" to family, friends, boss, co-workers, priests, cops, Oprah Winfrey, Sarah Palin etc and sound highly literate.

It even has the same acronym (SSDD).
Scholar 1: "How goes the research into Shakespeare's use of Jungian allegory in his tragedies?"

Scholar 2: "Scatalogically Similar: Diurnal Discrepancy."

Scholar 3: "Ah yes, indeed." (Cluemeter reading zero)

diuretic 

Medicine used by women or men who believe they have retained water weight. Causes urination amounts to increase. Water weight is typically regained when patient stops using the diuretic. Common over-the-counter forms include Diurex and beverages with caffeine and alcohol.
On my period, but not in pain. Just bloated. Time for diuretics.
diuretic by spammax June 24, 2010
The actual word for any animal or human who is active during the day and sleeps during the night.
Person 1: Haha dude, your sleeping habits are so weird. I'm just dayturnal.
Person 2: What the fuck is that?
Person 1: It means I sleep in the night and am active during the day. I saw it on Urban Dictionary, it was the word of the day!
Person 2: There's already a word for that fuckwit, it's called "diurnal." You can't just make up words that already exist. I guess Urban Dictionary is administrated by retards.
Diurnal by Person McGuire July 7, 2011
𝔇𝔦𝔲𝔯𝔩𝔞’s are one of a kind. A true, living unicorn. They are extremely unique and there is a good chance you will live your whole life without ever meeting one. If you are lucky enough to meet a Diurla, do everything you can to keep them in your life because there is no better friend, spouse, or companion you could ever ask for.
“Woah, I think I just met an angel
“No, that was just Diurla”
diurla by Baby Trash November 24, 2021