Etymology
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unleaded (adj.)

1610s, "having no lead," from un- (1) "not" + leaded (see lead (v.2)). In reference to gasoline, from 1965. In reference to printing, from 1902.

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Definitions of unleaded

unleaded (adj.)
not treated with lead;
unleaded gasoline
Synonyms: leadless
unleaded (adj.)
not having leads between the lines;
From wordnet.princeton.edu