tetramethyllead

noun
tet·ra·meth·yl·lead | \ ˌte-trə-ˌme-thəl-ˈled \

Definition of tetramethyllead 

: a volatile poisonous liquid Pb(CH3)4 used especially formerly as an antiknock agent

First Known Use of tetramethyllead

1964, in the meaning defined above

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The first known use of tetramethyllead was in 1964

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