Usually means: Active during the daytime hours.
Definitions Related words Phrases (New!) Mentions History Colors (New!)
We found 46 dictionaries that define the word diurnal:

General (25 matching dictionaries)
  1. diurnal: Merriam-Webster.com
  2. diurnal: Oxford Learner's Dictionaries
  3. diurnal: American Heritage Dictionary of the English Language
  4. diurnal: Collins English Dictionary
  5. diurnal: Vocabulary.com
  6. Diurnal, diurnal: Wordnik
  7. diurnal: Cambridge Advanced Learner's Dictionary
  8. diurnal: Wiktionary
  9. diurnal: Webster's New World College Dictionary, 4th Ed.
  10. diurnal: The Wordsmyth English Dictionary-Thesaurus
  11. diurnal: Infoplease Dictionary
  12. diurnal: Dictionary.com
  13. diurnal: Online Etymology Dictionary
  14. Diurnal: Wikipedia, the Free Encyclopedia
  15. Diurnal: Online Plain Text English Dictionary
  16. diurnal: Webster's Revised Unabridged, 1913 Edition
  17. diurnal: Rhymezone
  18. Diurnal: AllWords.com Multi-Lingual Dictionary
  19. diurnal: Webster's 1828 Dictionary
  20. diurnal: Free Dictionary
  21. diurnal: Mnemonic Dictionary
  22. diurnal: Dictionary/thesaurus
  23. diurnal: Wikimedia Commons US English Pronunciations

Business (1 matching dictionary)
  1. diurnal: Legal dictionary

Computing (1 matching dictionary)
  1. diurnal: Encyclopedia

Medicine (5 matching dictionaries)
  1. Dorland's Illustrated Medical Dictionary (No longer online)
  2. Diurnal: MedTerms.com Medical Dictionary
  3. online medical dictionary (No longer online)
  4. diurnal: Medical dictionary
  5. Diurnal: Drug Medical Dictionary

Miscellaneous (2 matching dictionaries)
  1. diurnal: A Word A Day
  2. diurnal: Wordcraft Dictionary

Science (7 matching dictionaries)
  1. Bird On! (No longer online)
  2. Diurnal: Solar Radiation Resource Terms
  3. Botanical Terms (No longer online)
  4. Tree of Life Glossary (No longer online)
  5. Fishkeeping glossary (No longer online)
  6. Anthropology dictionary (No longer online)
  7. Weather Glossary (No longer online)

Slang (1 matching dictionary)
  1. Diurnal: Urban Dictionary

Tech (4 matching dictionaries)
  1. Glossary of Meteorology (No longer online)
  2. National Weather Service Glossary (No longer online)
  3. SeaTalk Dictionary of English Nautical Language (No longer online)
  4. Diurnal: Latitude Mexico

(Note: See diurnally as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
adjective:  Happening or occurring during daylight, or primarily active during that time.
adjective:  (botany) Said of a flower open, or releasing its perfume during daylight hours, but not at night.
adjective:  Having a daily cycle that is completed every 24 hours, usually referring to tasks, processes, tides, or sunrise to sunset; circadian.
adjective:  (uncommon) Done once every day; daily, quotidian.
adjective:  (archaic) Published daily.
noun:  A flower that opens only in the day.
noun:  (Catholicism) A book containing canonical offices performed during the day, hence not matins.
noun:  (archaic) A diary or journal.
noun:  (archaic) A daily news publication.

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