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Definition of Petroselinic acid
1. Noun. (fatty acid) An unsaturated fatty acid ''cis-6-octadecenoic acid'' found in many members of the ''Apiaceae'' family (e.g. parsley seed oil); it is a positional isomer of oleic acid, the double bond being in position 6 instead of 9. ¹
¹ Source: wiktionary.com