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Pronunciation varies by accent · noun
The branch of chemistry that deals with petroleum, natural gas and their derivatives..
Use petrochemistry when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Petrochemistry means The branch of chemistry that deals with petroleum, natural gas and their derivatives..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use petrochemistry where its definition matches the intended context.
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