unleaded

adjective

1. (of gasoline) containing no tetraethyllead; lead-free.
2. Printing. not separated or spaced with leads, as lines of type or printed matter.

noun

3. an unleaded product, especially gasoline that contains no tetraethyllead.

adjective

1. (of petrol) containing a reduced amount of tetraethyl lead, in order to reduce environmental pollution
2. not covered or weighted with lead
3. printing (of lines of type, etc) not spaced or separated with leads; solid

noun

4. petrol containing a reduced amount of tetraethyl lead

adj.1610s, from un- (1) “not” + leaded (see lead (n.)). In reference to gasoline, from 1965.