Word.ws English Dictionary

ultradian

ultradian adjective: cyclical with a periodicity significantly shorter than 24 hours, that is, more frequent than circadian.

Adjective

ultradian (not comparable)

  1. Cyclical with a periodicity significantly shorter than 24 hours, that is, more frequent than circadian.
    • Ultradian rhythms […] operate in cycles of less than 24 hours, that is they happen more than once a day.1999, Evie Bentley, Awareness: Biorhythms, Sleep and Dreaming, page 15

Questions about ultradian

What does ultradian mean?
Ultradian means cyclical with a periodicity significantly shorter than 24 hours, that is, more frequent than circadian.
What part of speech is ultradian?
Ultradian is an adjective.

Words near ultradian in the dictionary

  1. ultradespotic
  2. ultradestructive
  3. ultradetailed
  4. ultradiafiltration
  5. ultradiafiltrations
  6. ultradian
  7. ultradifferentiability
  8. ultradifferentiable
  9. ultradifferential
  10. ultradiffuse
  11. ultradignified

Source and license

Adapted from Wiktionary: ultradian (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

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