Meaning
Of, relating to, or showing rhythmic behaviour with a period of approximately 24 hours; especially of a biological process.
Etymology
Origin: Middle English
Etymology tree Proto-Indo-European *(s)ker-der. Ancient Greek κίρκος (kírkos)bor. Latin circus Latin circum Latin circā Proto-Indo-European *dyew- Proto-Indo-European *-s Proto-Indo-European *dyḗws Proto-Italic *djous Latin diēs Proto-Indo-European *-nós Proto-Italic *-nos Proto-Italic *-ānos Latin -ānus Old French -ainder. Middle English -an English -an English circadian From Latin circā (“around”) + diēs (“day”) + English -an. Compare circannual.
Synonyms & Antonyms
NYT Puzzle Appearances
Accepted in 4 recorded puzzles: