antiknock

Definitions of antiknock

1. noun

   any of various compounds that are added to gasoline to reduce engine knocking
   types:

   lead tetraethyl, tetraethyl lead

   a clear oily poisonous liquid added to gasoline to prevent knocking

   type of:

   chemical compound, compound

   (chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight
2. adjective

   suppressing or eliminating engine knock in combustion engines
   “antiknock properties”

   “antiknock rating”

   synonyms: antiknocking

   leaded

   treated or mixed with lead