Etymology of the English word circadian
the English word
circadianderived from the Latin word
circaderived from the Latin word
circus (race course; circus in Rome, celebration of games)
derived from the Greek word
kirkosderived from the Proto-Indo-European root
*kirk-derived from the Proto-Indo-European root
*sker- (to turn, bend)
derived from the Latin word
dies (day; daylight; specific day; day in question; date of letter)
derived from the Proto-Indo-European root
*dyeu-Date
The earliest known usage of circadian in English dates from the 20th century.
Derivations in English
ultradianUsage
Word found in Modern English
