infradian

infradian
Relating to biologic variations or rhythms occurring in cycles less frequent than every 24 hours. Cf.:circadian, ultradian. [infra- + L. dies, day]

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in·fra·di·an in-'frā-dē-ən adj being, characterized by, or occurring in periods or cycles (as of biological activity) of less than 24 hours <\infradian rhythms of growth> compare CIRCADIAN, ULTRADIAN

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in·fra·di·an (in″frə-deґən) [infra- + L. dies day] pertaining to the rhythmic repetition of certain phenomena in living organisms occurring in cycles of less frequency than circadian, that is, less frequently than once a day. Cf. circadian and ultradian.

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  • Infradian rhythm — An infradian rhythm is a rhythm with a period greater than the period of a circadian rhythm, i.e. with a frequency smaller than one cycle in 28 hours. [Brown, Frederick M. Graeber, R. Curtis, eds.. The Rhythmic Aspects of Behavior. Hillsdale, NJ …   Wikipedia

  • infradian — adjective Cyclical with a periodicity significantly longer than 24 hours, that is, less frequent than circadian …   Wiktionary

  • infradian — in|fra|di|a̲n [zu ↑infra... u. lat. dies = Tag]: jenseits der 24 Stunden Periodik ablaufend (von Lebensvorgängen gesagt) …   Das Wörterbuch medizinischer Fachausdrücke

  • infradian — in|fra|di|an <aus gleichbed. nlat. infradianus zu ↑infra... u. lat. dies »Tag«> einen Biorhythmus bezeichnend, dessen Periodenlänge mehr als einen Tag aufweist (z. B. den Menstruationszyklus der Frau; Med., Biol.) …   Das große Fremdwörterbuch

  • infradian — [ɪn freɪdɪən] adjective Physiology recurring less than once a day. Compare with ultradian. Origin 1960s: from infra below , on the pattern of circadian …   English new terms dictionary

  • infradian — …   Useful english dictionary

  • infradian rhythm — a biological rhythm with a periodicity longer than 28 hours or with a frequency less than one cycle per 24 hour, e.g. lunar and seasonal rhythms …   Dictionary of ichthyology

  • infradian rhythm — the regular recurrence in cycles of more than 24 hours from one stated point to another, such as certain biologic activities that occur at such intervals, regardless of conditions of illumination …   Medical dictionary

  • ultradian — Relating to biologic variations or rhythms occurring in cycles more frequent than every 24 hours. Cf.:circadian, infradian. [ultra + L. dies, day] * * * ul·tra·di·an əl trād ē ən adj being, characterized by, or occurring in periods or cycles (as… …   Medical dictionary

  • Biorhythm — A biorhythm (from Greek βιορυθμός biorhuthmos ) is a hypothetical cycle in physiological, emotional, or intellectual well being or prowess. Bio pertains to life and rhythm pertains to the flow with regular movement. Biorhythms theory has no more… …   Wikipedia

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