ultradian

[ uhl-trey-dee-uhn ]
/ ʌlˈtreɪ di ən /

adjective

of or relating to a biorhythm having a period of less than 24 hours.

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Origin of ultradian

First recorded in 1960–65; ultra- + Latin di(ēs) “day” + -an
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Medical definitions for ultradian

ultradian
[ ŭl-trādē-ən ]

adj.

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.