Enter a clue or pattern or both:

The Clue

Petroleum gases (9 letter answer)

The Answer

ETHYLENES

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Notes

The answer ETHYLENES is so rare that it appears less than once every 2500 puzzles.

Definition

ETHYLENE as a noun:

1. (ethylene, ethene) = a flammable colorless gaseous alkene; obtained from petroleum and natural gas and used in manufacturing many other chemicals; sometimes used as an anesthetic