Definition of omega-6
: being or composed of polyunsaturated fatty acids in which the first double bond in the hydrocarbon chain occurs between the sixth and seventh carbon atoms from the end of the molecule most distant from the carboxylic acid group and which are found especially in vegetable oils, nuts, beans, seeds, and grains — compare omega-3
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Merriam-Webster unabridged
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Time Traveler for omega-6
The first known use of omega-6 was in 1976
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