Ultradian Definition

ŭl-trādē-ən
adjective
Relating to or exhibiting periodic physiological activity that occurs more than once every 24 hours.
American Heritage Medicine

Cyclical with a periodicity significantly shorter than 24 hours, that is, more frequent than circadian.

Wiktionary

Origin of Ultradian

  • ultra– (circa)dian

    From American Heritage Dictionary of the English Language, 5th Edition

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ultradian