Definition of omega-3
: 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
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Merriam-Webster unabridged
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Time Traveler for omega-3
The first known use of omega-3 was in 1967
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