[aging] Also known as epigenetic clock, Horvath`s clock, or DNA methylation age, this biological aging clock is an `age predictor` that can be used to measure the age of most human tissues, cell types, or organs`. Salient features of the epigenetic clock include its high accuracy and its applicability to a broad spectrum of tissues and cell...
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http://en.wikipedia.org/wiki/Biological_clock_(aging)
(from the article `biological rhythm`) The internal mechanism by which such a rhythmic phenomenon occurs and is maintained even in the absence of the apparent environmental stimulus is ... ...the faculty, both in 1921. In 1922 he became director of Johns Hopkins` psychiatric clinic, a post that he held until becoming professor of ... ...
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http://www.britannica.com/eb/a-z/b/67
<biology, physiology> An internal biological mechanism which controls certain biological rhythms and biocycles, such as metabolism, sleep cycles, photosynthesis. ... (21 Mar 1998) ...
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http://www.encyclo.co.uk/local/20973
the physiologic mechanism that governs the rhythmic occurrence of certain biochemical, physiologic, and behavioral phenomena in living organisms. See also biological rhythms.
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http://www.encyclo.co.uk/local/21001
[
n] - an innate mechanism in living organisms that controls the periodicity of many physiological functions
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http://www.webdictionary.co.uk/definition.php?query=biological%20clock
biological clock The internal mechanism of an organism that regulates circadian rhythms (daily cycles of activities) observed in many living organisms and various other periodic cycles. The mechanism of the biological clock has long proved elusive; however, a molecular basis for such a clock in the fruit fly Drosophila has been discovered, and sim...
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http://www.wordinfo.info/words/index/info/view_unit/2819/16
noun an innate mechanism in living organisms that controls the periodicity of many physiological functions
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https://www.encyclo.co.uk/local/20974
Regular internal rhythm of activity, produced by periodic changes in the concentrations of certain molecules, described as circadian rhythms. Such clocks are known to exist in almost all animals, and also in many plants, fungi, and unicellular organisms. In higher organisms, there appears to be a series of clocks of graded importance. For example, ...
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https://www.encyclo.co.uk/local/21221
an innate mechanism of the body that regulates its rhythmic and periodic cycles, as that of sleeping and waking.
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https://www.infoplease.com/dictionary/biological-clock
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