ultradian
English edit
Adjective edit
ultradian (not comparable)
- Cyclical with a periodicity significantly shorter than 24 hours, that is, more frequent than circadian.
- 1999, Evie Bentley, Awareness: Biorhythms, Sleep and Dreaming, page 15:
- Ultradian rhythms […] operate in cycles of less than 24 hours, that is they happen more than once a day.