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

Plus, a specialized fatty acid called lecithin, which is found in egg yolks. —Renée Onque, CNBC, 26 Nov. 2025

The formula combines argan oil, rich in omega-6 fatty acids and vitamin E, with functional silicones that form a smoothing film to cushion the cuticle and minimize mechanical wear from brushing, pillow friction, and heat styling. —Jailynn Taylor, Allure, 25 Nov. 2025

Fatty Fish Fatty fish, including salmon, mackerel, trout, and sardines, are packed with omega-3 fatty acids, which are anti-inflammatory and protect cells. —Jillian Kubala, Health, 25 Nov. 2025

Keep in mind, however, that typical doses of chlorella (5 milligrams) in supplement form don't contain significant amounts of fiber or fatty acids. —Jennifer Lefton, Verywell Health, 24 Nov. 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