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
Salmon and Other Fatty Fish Another food rich in omega-3 fatty acids is fatty fish, which include salmon, mackerel, herring, sardines, and tuna.
—
Audrey Noble, Vogue, 21 July 2025
The doctor also suggested considering certain supplements to foster better brain health, including vitamin D, omega-3 or fish oil, or a daily multi-vitamin.
—Angelica Stabile, FOXNews.com, 16 July 2025
As far as relieving depression symptoms, there was little conclusive evidence that omega-3 supplements had any impact; the scientists found more studies produced no effects than those that showed some, compared to a placebo.
—New Atlas, 14 July 2025
The omega-6 & omega-3 balance Most Americans eat about 10 times more omega-6 fats than omega-3 fats.
—Maria Godoy, NPR, 7 July 2025
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Audrey Noble, Vogue, 21 July 2025
The doctor also suggested considering certain supplements to foster better brain health, including vitamin D, omega-3 or fish oil, or a daily multi-vitamin.
—Angelica Stabile, FOXNews.com, 16 July 2025
As far as relieving depression symptoms, there was little conclusive evidence that omega-3 supplements had any impact; the scientists found more studies produced no effects than those that showed some, compared to a placebo.
—New Atlas, 14 July 2025
The omega-6 & omega-3 balance Most Americans eat about 10 times more omega-6 fats than omega-3 fats.
—Maria Godoy, NPR, 7 July 2025
See All Example Sentences for omega-3
Cite this Entry
“Omega-3.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/omega-3. Accessed 29 Jul. 2025.
Copy CitationMedical 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
Nutrition Action Health Letter
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
Andy Coghlan, New Scientist
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