fatty acid

noun

1
: any of numerous saturated aliphatic monocarboxylic acids CnH2n+1COOH (such as acetic acid) including many that occur naturally usually in the form of esters in fats, waxes, and essential oils
2
: any of the saturated or unsaturated monocarboxylic acids (such as palmitic acid) usually with an even number of carbon atoms that occur naturally in the form of glycerides in fats and fatty oils

Examples of fatty acid in a Sentence

Recent Examples on the Web
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Fatty Fish Fatty fish, such as salmon, mackerel, sardines, and tuna, are rich in protein and omega-3 fatty acids, which support heart health. Brittany Poulson, Verywell Health, 14 Oct. 2025 The healthiest oils for frying are resistant to high-temperature cooking, have a high smoking point, and have a favorable fatty acid profile. Merve Ceylan, Health, 10 Oct. 2025 This bacteria ferments fiber into short-chain fatty acids that enhance Treg cell function and help maintain gut health. Mitzi Nagarkatti, The Conversation, 10 Oct. 2025 The team made the discovery while investigating how different dietary fatty acids could influence this small subset of T cells that act as rapid-response soldiers against infection and tumor growth. New Atlas, 9 Oct. 2025 See All Example Sentences for fatty acid

Word History

First Known Use

1838, in the meaning defined at sense 1

Time Traveler
The first known use of fatty acid was in 1838

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Cite this Entry

“Fatty acid.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/fatty%20acid. Accessed 20 Oct. 2025.

Kids Definition

fatty acid

noun
: any of numerous acids that contain only carbon, hydrogen, and oxygen and occur naturally in fats and various oils

Medical Definition

fatty acid

noun
1
: any of numerous saturated aliphatic acids CnH2n+1COOH (as lauric acid) containing a single carboxyl group and including many that occur naturally usually in the form of esters in fats, waxes, and essential oils
2
: any of the saturated or unsaturated organic acids (as palmitic acid) that have a single carboxyl group and usually an even number of carbon atoms and that occur naturally in the form of glycerides in fats and fatty oils

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