fatty acid

noun

1

: any of numerous saturated aliphatic monocarboxylic acids C_nH_2n+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

For omega-3 fatty acids, try canola, walnuts, or soybeans. —Marianne Krasny, Forbes.com, 31 Mar. 2025

However, abiotic fatty acids do tend to be smaller in size than 12 carbon atoms. —Keith Cooper, Space.com, 25 Mar. 2025

Beef tallow also retains more nutrients than seed oils do, though both have some degree of essential fatty acids, experts said. —Kristen Rogers, CNN, 25 Mar. 2025

Take nutritional supplements: Speak to your healthcare provider about supplements that contain essential fatty acids, like fish oil, which might help decrease dry eye symptoms. —Sarah Bence, Health, 23 Mar. 2025

Word History

First Known Use

1838, in the meaning defined at sense 1

Rhymes for fatty acid

• antacid
• placid

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 C_nH_2n+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