semicircadian

English

Alternative forms

• semi-circadian

Etymology

From semi- +‎ circadian.

Adjective

semicircadian (not comparable)

1. Occurring twice in a 24 hour period.
   • 2022 December 4, Wikipedia contributors, “Circasemidian rhythm”, in English Wikipedia‎^[1], Wikimedia Foundation:

     In chronobiology, a circasemidian rhythm is a physiological arousal cycle that peaks twice in a 24-hour day. It may also be called the semicircadian rhythm .

   • 2020 August 12, Nira Ben-Jonathan, Dopamine: Endocrine and Oncogenic Functions, CRC Press, pages 88-89:

     During early pregnancy, PRL secretion occurs in a semi-circadian rhythm, characterized by a large nocutrnal surge and a slightly smaller diurnal surge.

   • 2005 August 18, Adalberto Luis Val, Vera Maria Fonseca de Almeida e Val, David J. Randall, Fish Physiology: The Physiology of Tropical Fishes, Elsevie, page 120:

     … individuals from a rocky shore with a rhythmic tidal pattern and a large tidal range exhibited a semicircadian activity rhythm (period around 12h), but no such rhythm was detected for fish from a rocky shore with an irregular tidal pattern and a small tide range.