omega-6 fatty acid A family of polyunsaturated fatty acids that have in common a final carbon-carbon double bond in the n-6 position, i.e., the sixth bond from the methyl end of the fatty acid. PMID:19035453 omega-6 fatty acids omega-6 fatty acid CHEBI:36009 PMID:19136835 chebi_ontology omega-6 fatty acid ω−6 fatty acid essential fatty acid