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ultradian
[ uhl-trey-dee-uhn ]
adjective
, Physiology.
- of or relating to a biorhythm or regular biological cycle having a period of less than 24 hours, such as the movement of blood through the circulatory system. Compare circadian ( def ), infradian ( def ).
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Word History and Origins
Origin of ultradian1
First recorded in 1960–65; ultra- ( def ) + Latin di(ēs) “day” + -an ( def )
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