We found 19 dictionaries that define the word circadian rhythm:

General (10 matching dictionaries)

1. circadian rhythm: American Heritage Dictionary of the English Language
2. circadian rhythm: Vocabulary.com
3. circadian rhythm: Wiktionary
4. circadian rhythm: Dictionary.com
5. Circadian Rhythm (film), Circadian Rhythm, Circadian rhythm: Wikipedia, the Free Encyclopedia
6. circadian rhythm: Rhymezone
7. circadian rhythm: FreeDictionary.org
8. circadian rhythm: Mnemonic Dictionary
9. circadian rhythm: TheFreeDictionary.com
10. circadian rhythm: Wikimedia Commons US English Pronunciations

Business (1 matching dictionary)

11. circadian rhythm: Legal dictionary

Computing (1 matching dictionary)

12. circadian rhythm: Encyclopedia

Medicine (5 matching dictionaries)

13. Dorland's Illustrated Medical Dictionary (No longer online)
14. Medical Dictionary (No longer online)
15. online medical dictionary (No longer online)
16. Sleep Terms (No longer online)
17. circadian rhythm: Medical dictionary

Science (2 matching dictionaries)

18. Agricultural Thesaurus and Glossary (No longer online)
19. Bird On! (No longer online)

(Note: See circadian_rhythms as well.)

Definitions from Wiktionary (circadian rhythm) ▸ noun:  (biology, sleep medicine) The internal body clock that regulates the roughly 24-hour cycle of biological processes in animals and plants. Similar: biological clock, body clock, biorhythm, entrainment, bioclock, chronophysiology, chronobiology, chronomodulation, photosynchronization, photoentrainment, more... Opposite: arrhythmia Types: diurnal, nocturnal, crepuscular, ultradian, infradian, free-running, entrained, disrupted, more... Phrases: Circadian rhythm sleep disorder, circadian rhythm sleep disorders, Light effects on circadian rhythm, more... Adjectives: circadian, homochronous, diachronic, orientational, chronological, chronographical, isochronous, gnomical, achronic, ergonometric, timeless ▸ Words similar to circadian rhythm ▸ Usage examples for circadian rhythm ▸ Idioms related to circadian rhythm ▸ Wikipedia articles (New!) ▸ Words that often appear near circadian rhythm ▸ Rhymes of circadian rhythm ▸ Invented words related to circadian rhythm