has role omega-3 fatty acid omega-3 fatty acid n-3 fatty acid n-3 fatty acids omega-3 fatty acids A family of polyunsaturated fatty acids that have in common a final carbon-carbon double bond in the ω−3 position, i.e., the third bond from the methyl end of the fatty acid. polyunsaturated fatty acid essential fatty acid marine metabolite plant metabolite bacterial metabolite human metabolite