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tetraethyl lead

(tetrə et̸həl)

a heavy, colorless, poisonous compound of lead, Pb(CH), added to gasoline to increase power and prevent engine knock

See tetraethyl lead in American Heritage Dictionary 4

also tet·ra·eth·yl·lead

noun
A colorless, poisonous, oily liquid, Pb(C2H5)4, used in gasoline for internal-combustion engines as an antiknock agent.

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