Definition of Diurnal

1. Adjective. Of or belonging to or active during the day. "Diurnal and nocturnal offices"

Category relationships: Biological Science, Biology
Antonyms: Nocturnal

2. Adjective. Having a daily cycle or occurring every day. "Diurnal rotation of the heavens"
Similar to: Periodic, Periodical

Definition of Diurnal

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

2. n. A daybook; a journal.

Definition of Diurnal

1. Adjective. Happening or occurring during daylight, or primarily active during that time. ¹

2. Adjective. (botany) Said of a flower open, or releasing its perfume during daylight hours, but not at night. ¹

3. Adjective. Having a daily cycle that is completed every 24 hours, usually referring to tasks, processes, tides, or sunrise to sunset. ¹

4. Adjective. (uncommon) Done once every day; daily, quotidian. ¹

5. Adjective. (archaic) Published daily. ¹

6. Noun. A flower that opens only in the day. ¹

7. Noun. (context: Catholicism) A book containing canonical offices performed during the day, hence not matins. ¹

8. Noun. (archaic) A diary or journal. ¹

9. Noun. (archaic) A daily news publication. ¹

¹ Source: wiktionary.com

Definition of Diurnal

1. a diary [n -S] - See also: diary

Medical Definition of Diurnal

1. Occurring during the day. This entry appears with permission from the Dictionary of Cell and Molecular Biology (11 Mar 2008)

Lexicographical Neighbors of Diurnal

diulose
diuloses
diuranate
diuranates
diureide
diureides
diureses
diuresis
diuretic
diuretic drug
diuretical
diuretically
diuretick
diuretics
diurna
diurnal (current term)
diurnal arc
diurnal arcs
diurnal enuresis
diurnal parallax
diurnal periodicity
diurnal rhythm
diurnal variation
diurnalist
diurnalists
diurnally
diurnalness
diurnals
diurnation
diurnule

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