antiknock

Adjective

 * 1) Of an additive added to petroleum/gasoline to reduce the occurrence of engine knock.

Translations

 * Portuguese: antidetonante

Noun

 * 1) Such a substance, usually tetraethyl lead (also MMT, MTBE and ethanol)

Translations

 * Bulgarian: противодетонационен
 * Polish: antydetonator
 * Portuguese: antidetonante