Medical Dictionary

ultradian

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adjective ul·tra·di·an \əl-ˈtrād-ē-ən\

Medical Definition of ultradian

  1. :  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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