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
Walnuts are higher in omega-3 fatty acids, which support brain function, improve mood, and reduce depression.
—
Heather Jones, Verywell Health, 13 May 2026
Instead, experts encourage getting omega-3s from food.
—Julia Ries Wexler, Health, 12 May 2026
Your first thought might be, yes, to load up on vitamin C-rich foods, like oranges, and your omega-3s, but eggs are a heavy hitter, too.
—Mykenna Maniece, Vogue, 8 May 2026
The Mediterranean pattern delivers omega-3s, polyphenols, B vitamins and antioxidants from whole food sources alongside fiber and synergistic compounds that isolated supplements don’t replicate.
—Allison Palmer, Charlotte Observer, 7 May 2026
See All Example Sentences for omega-3
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Heather Jones, Verywell Health, 13 May 2026
Instead, experts encourage getting omega-3s from food.
—Julia Ries Wexler, Health, 12 May 2026
Your first thought might be, yes, to load up on vitamin C-rich foods, like oranges, and your omega-3s, but eggs are a heavy hitter, too.
—Mykenna Maniece, Vogue, 8 May 2026
The Mediterranean pattern delivers omega-3s, polyphenols, B vitamins and antioxidants from whole food sources alongside fiber and synergistic compounds that isolated supplements don’t replicate.
—Allison Palmer, Charlotte Observer, 7 May 2026
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 22 May. 2026.
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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