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English definition of “petrochemical”

petrochemical

noun [C]     /ˌpetrəˈkemɪkəl/ NATURAL RESOURCES, PRODUCTION
one of the chemical substances obtained from oil or natural gas: Less than a third of the raw materials used by the group are petrochemicals.
petrochemicals [plural] products made from the chemical substances obtained from oil or natural gas: Our society is heavily dependent on oil-based goods such as plastics and petrochemicals. a petrochemicals company/business/plant
petrochemicals [U] (also the petrochemical industry) the industry that produces petrochemicals: Half the workers in this state are employed in petrochemicals.
(Definition of petrochemical noun from the Cambridge Business English Dictionary © Cambridge University Press)
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