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

The powerhouse seed is also a good source of antioxidants, heart-healthy omega-3 fatty acids (specifically alpha-linolenic acid), lignans, magnesium, and vitamin B1. —Christina Chaey, Bon Appetit Magazine, 30 Sep. 2025

Having a Poor Diet and Sedentary Lifestyle Eating a diet rich in vitamins, minerals, and healthy fatty acids is important for eye health. —Stephanie Brown, Verywell Health, 30 Sep. 2025

Bar soaps contain talc and fatty acids that leave a residue on your shower’s surfaces that can be hard to remove. —Karen Brewer Grossman, Southern Living, 28 Sep. 2025

Fatty Fish Consuming healthy fats, especially omega-3 fatty acids, may support better sleep. —Anthea Levi, Health, 26 Sep. 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