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Discovered in 1853 and popularized in the 1920s by Thomas Midgley Jr., Tetraethyllead (TEL) served as an incredibly effective "antiknock" agent for gasoline.

1. Tetraethyllead (TEL): The Rise and Fall of Leaded Gasoline Discovered in 1853 and popularized in the 1920s

In biology and medicine, "tel-" (from the Greek telos , meaning "end") refers to telomeres , the protective caps at the ends of linear chromosomes. Corporate Summary - Tokyo Electron Ltd. "tel-" (from the Greek telos

In the world of technology, TEL refers to Tokyo Electron Limited , a Japanese multinational and the world’s fourth-largest manufacturer of semiconductor production equipment as of 2025. meaning "end") refers to telomeres