zeitgeberEnglishOxford Dictionary of Englishzeitgeber /ˈzʌɪtɡeɪbə / ▸ noun Physiology a rhythmically occurring natural phenomenon which acts as a cue in the regulation of the body's circadian rhythms. – ORIGIN 1950s: from German Zeitgeber, from Zeit ‘time’ + Geber ‘giver’.
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EnglishOxford Dictionary of English