Enter a clue or pattern or both:
The Clue
Like some gasolines (9 letter answer)
The Answer
ANTIKNOCK
Tags
Notes
The answer ANTIKNOCK is so rare that it appears less than once every 2500 puzzles.
Definition
ANTIKNOCK as a noun:
1. any of various compounds that are added to gasoline to reduce engine knocking
ANTIKNOCK as an adjective:
1. (of gasoline) containing tetraethyl lead; "antiknock gasoline"