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There are 8 thirteen-letter words beginning with PETRO

PETROCHEMICALpetrochemical n. (Chemistry) Any compound derived from petroleum or natural gas.
petrochemical adj. Of or pertaining to the such compounds, or the industry that produces them.
PETROCHEMICAL adj. of or relating to chemicals obtained from petroleum.
PETROCHEMISTSpetrochemists n. Plural of petrochemist.
PETROCHEMIST n. someone who studies petrochemistry or works in the petrochemical industry.
PETROCURRENCYpetrocurrency n. The currency of an oil-producing nation which tends to vary in value against other currencies in line…
petrocurrency n. Money paid in dollars to oil-producing nations.
PETROCURRENCY n. currency, etc., acquired by the oil-producing countries as profit from the sale of their oil to the consumer countries.
PETROGLYPHIESPETROGLYPHY n. the art of carving on rocks.
PETROGRAPHERSpetrographers n. Plural of petrographer.
PETROGRAPHER n. a practitioner of petrography.
PETROGRAPHIESpetrographies n. Plural of petrography.
PETROGRAPHY n. the description and classification of rocks.
PETROLIFEROUSpetroliferous adj. (Geology, petrology, of a rock or geologic formation) Containing or yielding petroleum.
PETROLIFEROUS adj. bearing petroleum.
PETROPHYSICALpetrophysical adj. Relating to petrophysics.
PETROPHYSICAL adj. relating to petrophysics.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the WikWik.org and 1Word.ws.

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