| NOUN | substance | lead tetraethyl, tetraethyl lead | a clear oily poisonous liquid / liquid added to gasoline to prevent knocking |
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| Meaning | A clear oily poisonous liquid / liquid added to gasoline to prevent knocking. | |
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| Synonym | tetraethyl lead | |
| Broader | antiknock | Any of various compounds that are added to gasoline to reduce engine knocking |
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