(from the article `petroleum refining`) The advent of leaded, or ethyl, gasoline led to the manufacture of high-octane fuels and became universally employed throughout the world after World ... Found on http://www.britannica.com/eb/a-z/l/26
noun gasoline treated with a lead compound to reduce motor knocks; `combustion of leaded gasoline released lead into the air where it could cause lead poisoning` Found on https://www.encyclo.co.uk/local/20974