[ uhl-trey-dee-uhn ]
/ ʌlˈtreɪ di ən /
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of or relating to a biorhythm having a period of less than 24 hours.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021
Medical definitions for ultradian
[ ŭl-trā′dē-ən ]
Relating to or exhibiting periodic physiological activity that occurs more than once every 24 hours.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.