Etymology
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petrochemical (adj.)

"of or pertaining to the chemistry of the formation and composition of rocks," 1913, from petro- (1) "rock" + chemical (adj.).

petrochemical (n.)

"chemical compound or element obtained from petroleum or natural gas," 1942, from petro- (2) + chemical (n.).

updated on April 18, 2020

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Definitions of petrochemical from WordNet

petrochemical (n.)
any compound obtained from petroleum or natural gas;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.