We found 31 dictionaries that define the word circadian:

General (21 matching dictionaries)

1. circadian: Merriam-Webster
2. circadian: American Heritage Dictionary of the English Language
3. circadian: Collins English Dictionary
4. circadian: Vocabulary.com
5. Circadian, circadian: Wordnik
6. circadian: Wiktionary
7. circadian: Webster's New World College Dictionary, 4th Ed.
8. circadian: The Wordsmyth English Dictionary-Thesaurus
9. circadian: Infoplease Dictionary
10. circadian: Dictionary.com
11. circadian: Online Etymology Dictionary
12. Circadian (5th Projekt album), Circadian (album), Circadian: Wikipedia, the Free Encyclopedia
13. circadian: Rhymezone
14. circadian: FreeDictionary.org
15. circadian: The Phrontistery - A Dictionary of Obscure Words
16. circadian: Mnemonic Dictionary
17. circadian: TheFreeDictionary.com
18. circadian: Oxford Learner's Dictionaries
19. circadian: Longman Dictionary of Contemporary English

Computing (1 matching dictionary)

20. circadian: Encyclopedia

Medicine (7 matching dictionaries)

21. circadian: Merriam-Webster Medical Dictionary
22. Dorland's Illustrated Medical Dictionary (No longer online)
23. Circadian: MedTerms.com Medical Dictionary
24. online medical dictionary (No longer online)
25. Circadian: Medical dictionary
26. WeMove Glossary of Terms (No longer online)
27. Circadian: Drug Medical Dictionary

Miscellaneous (1 matching dictionary)

28. circadian: Wordcraft Dictionary

Science (1 matching dictionary)

29. Drug Discovery and Development (No longer online)

Definitions from Wiktionary ( ) ▸ adjective:  (biology) Of, relating to, or showing rhythmic behaviour with a period of 24 hours; especially of a biological process. Similar: cyclic, cyclical, diurnal, biorhythmic, circhoral, circalunar, circatidal, chronobiologic, rhythmic, chronophysiological, more... Opposite: acircadian, arrhythmic, non-circadian, irregular Phrases: circadian rhythms, circadian rhythm, Circadian clock, circadian cycle, circadian periodicity, more... Adjectives: human, endogenous, normal, natural, distinct Colors:     blue,     green,     teal,     cyan,     turquoise, more... ▸ Word origin ▸ Words similar to circadian ▸ Usage examples for circadian ▸ Idioms related to circadian ▸ Wikipedia articles (New!) ▸ Popular nouns described by circadian ▸ Words that often appear near circadian ▸ Rhymes of circadian ▸ Invented words related to circadian