antiknock

名词 antiknock:

1. any of various compounds that are added to gasoline to reduce engine knocking

形容词 antiknock:

1. (of gasoline) containing tetraethyl lead

an.ti.knock

n.（名词）
A substance, such as tetraethyl lead, added to gasoline to reduce engine knock.
抗震剂：一种加在汽油中可以减轻发动机震动的物质，如甲乙基铅