myo·​glo·​bin | \ ˌmī-ə-ˈglō-bən How to pronounce myoglobin (audio) , ˈmī-ə-ˌglō \

Definition of myoglobin

: a red iron-containing protein pigment in muscles that is similar to hemoglobin

Examples of myoglobin in a Sentence

Recent Examples on the Web His urine was dark because the oxygen-carrying parts of the muscle known as myoglobin were collecting in the kidneys. New York Times, 14 July 2021 His urine was not tested, but the discoloration was likely the result of the excess myoglobin. Washington Post, 12 Feb. 2021 Each company needed to come up with a means of mimicking myoglobin’s function in the sensory experience of biting into a cut of beef. Paul Tullis, Town & Country, 2 May 2021 Because of the large amount of myoglobin, these muscles appear dark. Joshua Selsby, CNN, 27 Nov. 2019 The high amount of myoglobin and subsequent oxygen in our muscle cells allows us to hold our breath for extended periods of time. Popular Science, 1 Jan. 2019 In beef, that color comes from myoglobin, a compound that transmits oxygen from the bloodstream to muscle cells. J. Kenji López-alt, New York Times, 3 Mar. 2020 One of the first came in 1962 after LMB researchers, having pioneered x-ray crystallography, used the technique to decipher the first atomic structures for proteins—those of myoglobin and hemoglobin, which carry oxygen in muscle tissue and blood. Eric Hand, Science | AAAS, 23 Jan. 2020 To failure and beyond From one non-scientist fitness enthusiast to another, here’s what happened: In a healthy workout, muscles get micro-tears and release small amounts of a toxic protein called myoglobin that passes through your system harmlessly. NBC News, 11 Jan. 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'myoglobin.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of myoglobin

1925, in the meaning defined above

History and Etymology for myoglobin

International Scientific Vocabulary

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Time Traveler for myoglobin

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The first known use of myoglobin was in 1925

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Last Updated

24 Jul 2021

Cite this Entry

“Myoglobin.” Dictionary, Merriam-Webster, Accessed 5 Aug. 2021.

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More Definitions for myoglobin


myo·​glo·​bin | \ ˌmī-ə-ˈglō-bən, ˈmī-ə-ˌ How to pronounce myoglobin (audio) \

Medical Definition of myoglobin

: a red iron-containing protein pigment in muscles that is similar to hemoglobin but differs in the globin portion of its molecule, in the smaller size of its molecule (as in the mammalian heart muscle which has only one fourth the molecular weight of the hemoglobin in the blood of the same animal), in its greater tendency to combine with oxygen, and in its absorption of light at longer wavelengths

called also myohemoglobin

More from Merriam-Webster on myoglobin Encyclopedia article about myoglobin


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