antiknocknoun [ U ]
uk/ˌæn.tiˈnɒk/us/ˌæn.t̬iˈnɑːk/a chemical that is added to the fuel of a car engine in order to make the fuel burn more effectively, so that the engine stops making a regular knocking sound
Thesaurus: synonyms and related words
Petroleum products especially when used as fuel
- derv
- four-star
- gas
- gasohol
- gasoline
- hexane
- kerosene
- LPG
- mineral oil
- octane
- octane number
- oil
- paraffin
- petrochemical
- petrol
- petroleum
- premium
- super
- unleaded
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antiknocking
adjective [ before noun ] uk/ˌæn.tiˈnɒk.ɪŋ/us/ˌæn.t̬iˈnɑː.kɪŋ/