Crossword puzzle clue "anti knock number"

Here are the possible solutions for anti knock number clue

Answer
Clue
Relevancy
octane
Clue
Anti-knock number
Definition
any of a series of saturated hydrocarbons
pro
Clue
Anti-anti?
Anti anti
Definition
(short for) a professional, or prostitute
ranch
Clue
Option for those who are anti-Russian and anti-French?
Definition
to work at an establishment for raising livestock
ethyl
Clue
Anti-knock fuel
Anti-knock fluid
Old anti-knock fuel
Anti-knock additive
Definition
a univalent chemical radical, also ETHINYL, ETHOXY, ETHOXYL, ETHYNYL

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