nyctohemeral rhythm

nyctohemeral rhythm
a day and night rhythm.

Medical dictionary. 2011.

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  • Circadian — Refers to events occurring within a 24 hour period, in the span of a full (24 hour) day, as in a circadian rhythm. The word “circadian” is a 20th century invention. It was coined in 1959 from the Latin “circa” (around) + “diem” (a day). However,… …   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

  • circadian — adj. denoting a biological rhythm or cycle of approximately 24 hours. Compare: nyctohemeral, ultradian …   The new mediacal dictionary

  • ultradian — adj. denoting a biological rhythm or cycle that occurs more frequently than once in 24 hours. Compare: circadian, nyctohemeral …   The new mediacal dictionary

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