adj ·Rare ·Advanced level

Definitions

Adjective

1. 1
   Cyclical with a periodicity significantly shorter than 24 hours, that is, more frequent than circadian. not-comparable

   "Ultradian rhythms […] operate in cycles of less than 24 hours, that is they happen more than once a day."

Example

More examples

"Ultradian rhythms […] operate in cycles of less than 24 hours, that is they happen more than once a day."

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.