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infradian

[ in-frey-dee-uhn ]

adjective

, Physiology.
  1. of or relating to a biorhythm or regular biological cycle having a period of more than 24 hours, such as the migration of birds or the human menstrual cycle. Compare circadian ( def ), ultradian ( def ).


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Word History and Origins

Origin of infradian1

First recorded in 1965–70; infra- ( def ) + Latin di(ēs) “day” + -an ( def )

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infractioninfra dig