ahemeral
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ahemeral day — noun A light dark cycle that has more or less than 24 hours created artificially for testing the rhythms of organisms … Wiktionary
hemeral — adjective Daily; circadian; cyclical, with a period of 24 hours Photostimulation at 22 weeks of age was done with either a normal, hemeral day (14 hours of light; 10 hours of darkness) or a long ahemeral day (14 hours of light; 14 hours of… … Wiktionary