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

Cod has less sodium and more omega-3 fatty acids, beneficial to your heart, eyes, and brain. —Md Published, Verywell Health, 12 Mar. 2026

Soluble fibers from foods like oats, chia seeds, and legumes help nourish beneficial bacteria, which then produce compounds called short-chain fatty acids. —Lynn Andriani, Martha Stewart, 12 Mar. 2026

Certain fats, like omega-3 fatty acids, play specialized roles in the body by helping regulate inflammation and supporting heart and brain health. —Jillian Kubala, Health, 12 Mar. 2026

Resulting short-chain fatty acid compounds can contribute up to 10% of your daily calories. —Caroline Tien, SELF, 11 Mar. 2026

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