Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun antiknock

1 sense of antiknock

Sense 1
antiknock -- (any of various compounds that are added to gasoline to reduce engine knocking)
       => compound, chemical compound -- ((chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight)

Antonyms of adj antiknock

1 sense of antiknock

Sense 1
antiknock, antiknocking -- (suppressing or eliminating engine knock in combustion engines; "antiknock properties"; "antiknock rating")

INDIRECT (VIA leaded) -> unleaded, leadless -- (not treated with lead; "unleaded gasoline")

Similarity of adj antiknock

1 sense of antiknock

Sense 1
antiknock, antiknocking -- (suppressing or eliminating engine knock in combustion engines; "antiknock properties"; "antiknock rating")
       => leaded (vs. unleaded) -- (treated or mixed with lead; "leaded gasoline"; "leaded zinc")