Crossword Genius

Antiknock fluid

Ross

I believe the answer is:

ethyl

'antiknock fluid' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for ethyl that I've seen before include "-- Alcohol; -- acetate" , "Alkyl radical, base of common alcohol" , "compound" , "C2H5" .)

I've seen this clue in The New York Times.
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