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ultradian

[uhl-trey-dee-uh n] /ʌlˈtreɪ di ən/
adjective
1.
of or relating to a biorhythm having a period of less than 24 hours.
Origin
1960-1965
1960-65; ultra- + Latin di(ēs) day + -an
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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ultradian in Medicine

ultradian ul·tra·di·an (ŭl-trā'dē-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.
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