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ultradian Syllabification: ul·tra·di·an
Pronunciation: /əlˈtrādēən/

Definition of ultradian in English:


(Of a rhythm or cycle) having a period of recurrence shorter than a day but longer than an hour. Compare with infradian.
Example sentences
  • In the book Rossi provides essential historical data along with two of the author's favorite topics, ultradian rhythms and the four-stage creative cycle of healing and problem resolution.
  • Failure to synchronize your patterns of activity and stimulation with your body's natural circadian and ultradian rhythms puts a stress on the system.
  • Still slower ultradian rhythms, with a period of 2 h, and circadian rhythms have also been observed.


1960s: from ultra- 'beyond' (being of greater frequency than circadian) + -ian.

Definition of ultradian in:
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