biological clock

== English == === Noun === biological clock (plural biological clocks) (biology) Any of several mechanisms that regulate the periodicity of biological functions, such as the circadian rhythm. 2005 US Department of Health - Your guide to healthy sleep Your biological clock is actually a tiny bundle of cells in your brain that responds to light signals received through your eyes. (figuratively) A notional clock to which people should pay attention, lest menopause or andropause kicks in and it is too late for them to have children. Her biological clock is ticking. ==== Synonyms ==== body clock ==== Derived terms ==== tick-tock biological clock ==== Translations ==== === See also === biorhythm circadian rhythm