Circadian(adjective)
Relating to the body
Synonyms: Daily, Diurnal, 24-hour, Biological
Antonyms: Irregular, Random, Aperiodic, Noncyclic
Example: Bright screens at night can disrupt your circadian rhythm and make it harder to sleep.
Trick to remember: Think “circle + day” — circadian means the daily cycle that goes round and round in 24 hours.
Learn it with 19 more words: Daily Vocabulary – 24 December 2025 →
