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

Salmon and halibut also bring omega-3 fatty acids into the meal, which chicken does not offer in meaningful amounts. — Lauren Jarvis-Gibson july 9, Sacbee.com, 9 July 2026

Its formula is rich in fatty acids to help restore the skin’s elasticity and leave you with a smoother pout. — Bestreviews, Mercury News, 9 July 2026

Regulating Inflammation Fiber fuels beneficial bacteria in the large intestine that produce compounds known as short-chain fatty acids (SCFAs), which work to protect and maintain gut health. — Jillian Kubala, Health, 7 July 2026

As a treatment Hair oils that are rich in fatty acids can help improve hair density and encourage a balanced, healthy environment for hair to grow in, according to Rogerio Cavalcante, a hairstylist and owner of the Second Floor Salon in NYC. — Ariana Yaptangco, Glamour, 5 July 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