omega-3

adjective

ome·​ga-3 ō-ˈmā-gə-ˈthrē 

-ˈmē-,

-ˈme- 

: being or composed of polyunsaturated fatty acids that have the final double bond in the hydrocarbon chain between the third and fourth carbon atoms from the end of the molecule opposite that of the carboxyl group and that are found especially in fish, fish oils, green leafy vegetables, and some nuts and vegetable oils compare omega-6

omega-3 noun

Examples of omega-3 in a Sentence

Recent Examples on the Web

That means, in addition to the nutrients from the meat, your dog also gets anti-inflammatory nutrients, including chondroitin and omega-3. —Bestreviews, Chicago Tribune, 14 July 2025

Other studies suggest that eating more omega-3 fatty acids helps protect against type 2 diabetes and may reduce blood sugar in people with prediabetes.2219 However, another review showed that omega-3 fatty acids had no significant effects on blood sugar or insulin resistance. —Megan Nunn, Verywell Health, 14 July 2025

Other heath benefits include a high level of omega-3 fatty acids. —Philipp Wehsack, Vogue, 11 July 2025

Krill oil, which comes from tiny, shrimp-like crustaceans abundant in the Antarctic Ocean, boasts omega-3 fatty acids that may help improve heart health, fight inflammation and support brain and nervous system health, according to medical experts. —Deirdre Bardolf, FOXNews.com, 10 July 2025

Word History

First Known Use

1967, in the meaning defined above

Medical Definition

omega-3

adjective

ome·​ga-3 -ˈthrē 

variants also Omega-3

: being or composed of polyunsaturated fats that have the first double bond in the hydrocarbon chain occurring between the third and fourth carbon atoms from the end of the molecule most distant from the carboxylic acid group and that are found especially in fish, fish oils, green leafy vegetables, and some nuts and seeds

The two main omega-3 fatty acids in fish oil … appear to reduce the risk of dying from sudden cardiac arrest by about 30 percent.

—Nutrition Action Health Letter

compare omega-6

omega-3 noun

also Omega-3

Some plants, such as linseed, naturally produce an omega-3 called alpha-linolenic acid (ALA), and one way to increase the amount of omega-3 in our diet is to eat these plants …

—Andy Coghlan, New Scientist