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

Omega-3 fatty acids are promoted for many health benefits, but only some of these benefits have strong research to support their use. 1. —Jennifer Lefton, Verywell Health, 15 July 2025

Research shows that following a high-fiber diet can boost several aspects of health: Supports gut health: Fiber helps promote regular bowel movements and encourages the growth of bacteria that produce compounds called short-chain fatty acids (SCFAs) in the gastrointestinal tract. —Jillian Kubala, Health, 10 July 2025

These fatty acids play a role in lots of different body processes, including regulating inflammation. —Maria Godoy, NPR, 7 July 2025

Researchers from the Indiana University School of Public Health-Bloomington found that linoleic acid — a common omega-6 fatty acid found in a variety of seed oils — could help reduce the risk of heart disease and type 2 diabetes. —Melissa Rudy, FOXNews.com, 25 June 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