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

Key Takeaways Eating fish regularly—at least two servings a week—supports heart and brain health through omega-3 fatty acids. — Sarah Jividen, Verywell Health, 23 June 2026

In particular, the fatty acids may help inhibit the release of small inflammatory proteins believed to contribute to migraine development. — Joy Emeh, Health, 22 June 2026

Bar soap contains fatty acids that react with certain minerals, especially those in hard water. — Gabi De La Rosa, Southern Living, 21 June 2026

Instead, the fatty acids must be obtained from foods such as salmon, herring, mackerel, sardines, walnuts, chia seeds and flaxseeds. — Sandee Lamotte, CNN Money, 18 June 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