biorhythm
noun
bio·rhythm
ˈbī-ō-ˌri-t͟həm 
: an innately determined rhythmic biological process or function (such as sleep behavior)
also
: the internal mechanism that determines such a process or function
Examples of biorhythm in a Sentence
Recent Examples on the Web
Of course, everyone’s biorhythms are different.
—
Korin Miller, Outside, 12 Sep. 2025
Here is the mayfly on my hand bringing itself into synch with my biorhythms.
—John Kinsella, The New Yorker, 11 Dec. 2023
Its tone remains a bit distant, its pace a few clicks under what seems like the natural biorhythm of the play.
—Sara Holdren, Vulture, 16 Nov. 2023
Wearing black shorts, a blue undershirt and a black harness over his chest that tracked biorhythms, Dante Moore moved his arms rhythmically while standing alone on one corner of the field about 15 minutes before the start of UCLA’s training camp.
—Houston Mitchell, Los Angeles Times, 3 Aug. 2023
My son has a set biorhythm, and no arbitrary daylight saving law is going to shift it.
—Rachel Meyer, chicagotribune.com, 22 Nov. 2019
Deutsche Lufthansa AG last year began using 24 different light settings on its Airbus A350-900 planes to help manage passenger biorhythms during long haul flights.
—Robert Wall, WSJ, 24 Mar. 2018
Perhaps not coincidentally, these are the only two physiological features that Bromage found to directly correlate with the length of the new biorhythm.
—Quanta Magazine, 13 Dec. 2016
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Korin Miller, Outside, 12 Sep. 2025
Here is the mayfly on my hand bringing itself into synch with my biorhythms.
—John Kinsella, The New Yorker, 11 Dec. 2023
Its tone remains a bit distant, its pace a few clicks under what seems like the natural biorhythm of the play.
—Sara Holdren, Vulture, 16 Nov. 2023
Wearing black shorts, a blue undershirt and a black harness over his chest that tracked biorhythms, Dante Moore moved his arms rhythmically while standing alone on one corner of the field about 15 minutes before the start of UCLA’s training camp.
—Houston Mitchell, Los Angeles Times, 3 Aug. 2023
My son has a set biorhythm, and no arbitrary daylight saving law is going to shift it.
—Rachel Meyer, chicagotribune.com, 22 Nov. 2019
Deutsche Lufthansa AG last year began using 24 different light settings on its Airbus A350-900 planes to help manage passenger biorhythms during long haul flights.
—Robert Wall, WSJ, 24 Mar. 2018
Perhaps not coincidentally, these are the only two physiological features that Bromage found to directly correlate with the length of the new biorhythm.
—Quanta Magazine, 13 Dec. 2016
Cite this Entry
“Biorhythm.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/biorhythm. Accessed 4 Nov. 2025.
Copy CitationMedical Definition
biorhythm
noun
bio·rhythm
ˈbī-ō-ˌrit͟h-əm
: an innately determined rhythmic biological process or function (as sleep behavior)
also
: an innate rhythmic determiner of such a process or function
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