tetramethyllead

[ te-truh-meth-uh l-led ]
/ ˌtɛ trəˌmɛθ əlˈlɛd /

noun Chemistry.

a colorless liquid, (CH3)4Pb, insoluble in water, slightly soluble in alcohol and benzene, used as an antiknock agent in gasoline.
Also called TML

Origin of tetramethyllead

First recorded in 1960–65; tetra- + methyl + lead2