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There are 5 fourteen-letter words beginning with PETRO

PETROCHEMICALSpetrochemicals n. Plural of petrochemical.
PETROCHEMICAL n. a chemical obtained from petroleum.
PETROCHEMISTRYpetrochemistry n. (Petrochemistry) The branch of chemistry that deals with petroleum, natural gas and their derivatives.
PETROCHEMISTRY n. the branch of chemistry concerned with the extraction of chemicals from petroleum.
PETROGRAPHICALpetrographical adj. Alternative form of petrographic.
PETROGRAPHICAL adj. relating to petrography, also PETROGRAPHIC.
PETROLOGICALLYpetrologically adv. In a petrological way.
PETROLOGICAL adv. relating to petrology, also PETROLOGIC.
PETROPHYSICISTpetrophysicist n. One who studies petrophysics.
PETROPHYSICIST n. a student of 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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