Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. An innate, cyclical biological process or function.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Any cyclic biological or physiological pattern or activity
  • n. Any of three sinusoidal graphs, normally plotted by computer, having a person's birth date as origin that that are supposed to give meaningful information about emotional levels, physical energy levels, and mental/psychic sensitivity.

Etymologies

First coined 1960, from bio- +‎ rhythm (Wiktionary)

Examples

  • Interestingly, the word biorhythm is a compound Greek word meaning life and constant.

    Softpedia - Windows - All

  • As you know, the campaign trail as its own special kind of biorhythm and September is the beginning of the season to step it up.

    CNN Transcript Sep 20, 2007

  • Melatonin helps to regulate the biorhythm of all mammals: at night it enters the bloodstream and, in the case of cows, their milk; when it becomes light, melatonin production stops.

    German night milk may aid insomniacs

  • It suits my biorhythm, and satisfies the need for solitude, while still letting me be available to my family.

    Writer Unboxed » Blog Archive » AUTHOR INTERVIEW: Diana Gabaldon, part 3

  • Each of us has a distinctive biorhythm, with peaks of energy at certain hours and valleys of fatigue between them.

    Ten Minutes, That's It

  • Add this to our hyperpersonal news streams – and to the news potential of Google Wave – and the biorhythm and source of news changes ...

    Google Wave and news « BuzzMachine

  • The exact timing of your biorhythm is personal to you, but body temperature and therefore alertness is generally lowest at 4 A.M. It rises and peaks in the morning around 10 A.M. to 12 noon, then slumps somewhere between 2 and 4 P.M., at which time your body temperature rises and you get a second wind.

    THE PROGRAM

  • Add this to our hyperpersonal news streams – and to the news potential of Google Wave – and the biorhythm and source of news changes fundamentally.

    NewBizNews & Hyperpersonal news streams « BuzzMachine

  • Also look out for his biorhythm, runes, I Ching, stichomancy and tarot readings.

    ANC Daily News Briefing

  • His voice always took on a somber tone, and I knew his biorhythm was at a low, which meant I might get a visit at any time of the day or night, my poor dad mumbling to himself about the world's woes.

    O Saddam!

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