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brown fat

noun

: a mammalian heat-producing tissue occurring especially in human fetuses and newborn infants and in hibernating animals

called also brown adipose tissue

Examples of brown fat in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
It's even being studied as a promising obesity treatment, where it was shown to boost brown fat burn and encourage white fat to turn brown in mice. New Atlas, 16 Nov. 2025 In order to generate heat, the brown fat cells need to draw on energy reserves stored in other fat cells. Diana Hubbell, Popular Science, 10 Sep. 2025 This study suggests that the brain’s recollection of cold can act as a switch, turning on the metabolic furnace of brown fat even when the surrounding air is mild. William A. Haseltine, Forbes.com, 20 Aug. 2025 Some studies suggest that CBD may help convert white fat into brown fat, which is more metabolically active and helps burn calories-though more human research is needed to confirm this effect. Tribune Content Agency, Mercury News, 30 Apr. 2025 See All Example Sentences for brown fat

Word History

First Known Use

1902, in the meaning defined above

Time Traveler
The first known use of brown fat was in 1902

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Cite this Entry

“Brown fat.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/brown%20fat. Accessed 30 Nov. 2025.

Medical Definition

brown fat

noun
: a mammalian heat-producing tissue occurring especially in human fetuses and newborn infants and in hibernating animals

called also brown adipose tissue

Last Updated: - Updated example sentences
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