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ultradian

adjective
ul·​tra·​di·​an | \ əl-ˈtrād-ē-ən How to pronounce ultradian (audio) \

Medical Definition of ultradian

: 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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