Added 9 October 2026 petrochemical noun Categories: NatureRare Words noun ! Definition from WordNet 3.1, Princeton University. More about petrochemical at Wordnik → Where our words come from → Any compound obtained from petroleum or natural gas. Related Words: petroleumoilchemicalschemicalpicinsurancesinopecpetrochempetchempetroproductpetrocarbonpetroline Back to today's word