ul·​tra·​di·​an əl-ˈtrād-ē-ən How to pronounce ultradian (audio)
: being, characterized by, or occurring in periods or cycles (as of biological activity) of less than 24 hours and often repeated frequently (as every 90 minutes) throughout a 24-hour period compare circadian, infradian

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Cite this Entry

“Ultradian.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/ultradian. Accessed 4 Mar. 2024.

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