(of gasoline) containing tetraethyllead.

1935–40; lead2 + -ed3

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World English Dictionary
leaded (ˈlɛdɪd)
1.  (of windows) composed of small panes of glass held in place by thin grooved strips of lead: leaded lights
2.  (of petrol) containing tetraethyl lead in order to improve combustion

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
The castle gallery retains its original hand-painted ceilings and leaded windows.
Drive into almost any gas station these days and you find leaded and unleaded, regular and super, ethanol and methanol.
The government formed a partnership with the private sector and, in less than a year, had phased out leaded gas nationwide.
Never use leaded gasoline or any other fuel not recommended in the previous text on fuel.
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