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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This slowly digesting form of starch, found in legumes, passes to the colon mostly undigested, where it's fermented into short-chain fatty acids (SCFAs). Lauren Panoff, Verywell Health, 3 Apr. 2026 There are majorana leaf and Japanese plum leaf extracts to soothe, protect, and promote an optimal scalp environment, along with argan oil, the brand’s signature ingredient rich in nourishing vitamin E, antioxidants, and essential fatty acids. Cathy Nelson, InStyle, 3 Apr. 2026 Regularly eat fish and seafood, which contain omega-3 fatty acids that help to lower blood pressure and reduce inflammation. Emily Kay Votruba, EverydayHealth.com, 31 Mar. 2026 Rather than any single food group, the culprits were not enough protective elements such as omega-3 fatty acids found in seafood and or the fiber, fruits, and vegetables in healthy diets. Theresa Gaffney, STAT, 31 Mar. 2026 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 5 Apr. 2026.

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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